861809922152 has 16 divisors (see below), whose sum is σ = 1625569616160. Its totient is φ = 428324691184.

The previous prime is 861809922133. The next prime is 861809922163. The reversal of 861809922152 is 251229908168.

It is a happy number.

It is a super-2 number, since 2×861809922152² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 861809922094 and 861809922103.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322532318 + ... + 322534989.

It is an arithmetic number, because the mean of its divisors is an integer number (101598101010).

Almost surely, 2^861809922152 is an apocalyptic number.

It is an amenable number.

861809922152 is a deficient number, since it is larger than the sum of its proper divisors (763759694008).

861809922152 is a wasteful number, since it uses less digits than its factorization.

861809922152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645067480 (or 645067476 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 53.

The spelling of 861809922152 in words is "eight hundred sixty-one billion, eight hundred nine million, nine hundred twenty-two thousand, one hundred fifty-two".