172566955872 has 48 divisors (see below), whose sum is σ = 503320290480. Its totient is φ = 57522318336.

The previous prime is 172566955871. The next prime is 172566955879. The reversal of 172566955872 is 278559665271.

172566955872 is a `hidden beast` number, since 1 + 7 + 2 + 5 + 6 + 6 + 9 + 558 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172566955871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99864273 + ... + 99866000.

It is an arithmetic number, because the mean of its divisors is an integer number (10485839385).

Almost surely, 2^172566955872 is an apocalyptic number.

172566955872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

172566955872 is an abundant number, since it is smaller than the sum of its proper divisors (330753334608).

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

172566955872 is a wasteful number, since it uses less digits than its factorization.

172566955872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199730292 (or 199730278 counting only the distinct ones).

The product of its digits is 63504000, while the sum is 63.

The spelling of 172566955872 in words is "one hundred seventy-two billion, five hundred sixty-six million, nine hundred fifty-five thousand, eight hundred seventy-two".