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221666057675370 = 232571146796836171
BaseRepresentation
bin110010011001101010100110…
…101000000110001001101010
31002001212001211200112122100200
4302121222212220012021222
5213023234041231102440
62103235551525413030
764455562360042350
oct6231524650061152
91061761750478320
10221666057675370
11646a2057810010
1220a4044a26a176
13968c033c36709
143ca49a17657d0
151a96099988c30
hexc99aa6a0626a

221666057675370 has 192 divisors, whose sum is σ = 718697153341440. Its totient is φ = 46050628694400.

The previous prime is 221666057675341. The next prime is 221666057675417. The reversal of 221666057675370 is 73576750666122.

It is a super-2 number, since 2×2216660576753702 (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221666057675298 and 221666057675307.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 29007385 + ... + 35843555.

It is an arithmetic number, because the mean of its divisors is an integer number (3743214340320).

Almost surely, 2221666057675370 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221666057675370, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (359348576670720).

221666057675370 is an abundant number, since it is smaller than the sum of its proper divisors (497031095666070).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221666057675370 is a wasteful number, since it uses less digits than its factorization.

221666057675370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6840881 (or 6840878 counting only the distinct ones).

The product of its (nonzero) digits is 133358400, while the sum is 63.

The spelling of 221666057675370 in words is "two hundred twenty-one trillion, six hundred sixty-six billion, fifty-seven million, six hundred seventy-five thousand, three hundred seventy".