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81681853122 = 23213733123217
BaseRepresentation
bin100110000010010011…
…1100010101011000010
321210211112211001202100
41030010213202223002
52314241023244442
6101305113331230
75621103203322
oct1140447425302
9253745731670
1081681853122
1131706305241
12139b7106b16
1379196c958c
143d4c299282
1521d0e8a84c
hex13049e2ac2

81681853122 has 24 divisors (see below), whose sum is σ = 178269159276. Its totient is φ = 27028544256.

The previous prime is 81681853117. The next prime is 81681853129. The reversal of 81681853122 is 22135818618.

81681853122 is a `hidden beast` number, since 8 + 16 + 81 + 8 + 531 + 22 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 76894735401 + 4787117721 = 277299^2 + 69189^2 .

It is a super-2 number, since 2×816818531222 (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81681853129) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16559143 + ... + 16564074.

Almost surely, 281681853122 is an apocalyptic number.

81681853122 is an abundant number, since it is smaller than the sum of its proper divisors (96587306154).

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

81681853122 is a wasteful number, since it uses less digits than its factorization.

81681853122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33123362 (or 33123359 counting only the distinct ones).

The product of its digits is 184320, while the sum is 45.

The spelling of 81681853122 in words is "eighty-one billion, six hundred eighty-one million, eight hundred fifty-three thousand, one hundred twenty-two".

Divisors: 1 2 3 6 9 18 137 274 411 822 1233 2466 33123217 66246434 99369651 198739302 298108953 596217906 4537880729 9075761458 13613642187 27227284374 40840926561 81681853122