172111646856 has 16 divisors (see below), whose sum is σ = 430279117200. Its totient is φ = 57370548944.

The previous prime is 172111646849. The next prime is 172111646873. The reversal of 172111646856 is 658646111271.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3585659286 + ... + 3585659333.

It is an arithmetic number, because the mean of its divisors is an integer number (26892444825).

Almost surely, 2^172111646856 is an apocalyptic number.

It is an amenable number.

172111646856 is an abundant number, since it is smaller than the sum of its proper divisors (258167470344).

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

172111646856 is a wasteful number, since it uses less digits than its factorization.

172111646856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7171318628 (or 7171318624 counting only the distinct ones).

The product of its digits is 483840, while the sum is 48.

The spelling of 172111646856 in words is "one hundred seventy-two billion, one hundred eleven million, six hundred forty-six thousand, eight hundred fifty-six".