102156065172 has 36 divisors (see below), whose sum is σ = 295117522336. Its totient is φ = 29187447120.

The previous prime is 102156065159. The next prime is 102156065191. The reversal of 102156065172 is 271560651201.

102156065172 is a `hidden beast` number, since 1 + 0 + 21 + 560 + 6 + 5 + 1 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×102156065172² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 202690354 + ... + 202690857.

Almost surely, 2^102156065172 is an apocalyptic number.

102156065172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

102156065172 is an abundant number, since it is smaller than the sum of its proper divisors (192961457164).

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

102156065172 is a wasteful number, since it uses less digits than its factorization.

102156065172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405381228 (or 405381223 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The spelling of 102156065172 in words is "one hundred two billion, one hundred fifty-six million, sixty-five thousand, one hundred seventy-two".