172178160885 has 144 divisors (see below), whose sum is σ = 319757518080. Its totient is φ = 85667662080.

The previous prime is 172178160863. The next prime is 172178160919. The reversal of 172178160885 is 588061871271.

172178160885 is a `hidden beast` number, since 1 + 7 + 21 + 7 + 8 + 1 + 608 + 8 + 5 = 666.

It is not a de Polignac number, because 172178160885 - 2⁷ = 172178160757 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 301537650 + ... + 301538220.

It is an arithmetic number, because the mean of its divisors is an integer number (2220538320).

Almost surely, 2^172178160885 is an apocalyptic number.

172178160885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

172178160885 is a deficient number, since it is larger than the sum of its proper divisors (147579357195).

172178160885 is a wasteful number, since it uses less digits than its factorization.

172178160885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920 (or 894 counting only the distinct ones).

The product of its (nonzero) digits is 1505280, while the sum is 54.

The spelling of 172178160885 in words is "one hundred seventy-two billion, one hundred seventy-eight million, one hundred sixty thousand, eight hundred eighty-five".