72156504171 has 16 divisors (see below), whose sum is σ = 97797351680. Its totient is φ = 47310181920.

The previous prime is 72156504157. The next prime is 72156504181. The reversal of 72156504171 is 17140565127.

It is not a de Polignac number, because 72156504171 - 2⁹ = 72156503659 is a prime.

It is a super-2 number, since 2×72156504171² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72156504151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2039196 + ... + 2074278.

It is an arithmetic number, because the mean of its divisors is an integer number (6112334480).

Almost surely, 2^72156504171 is an apocalyptic number.

72156504171 is a deficient number, since it is larger than the sum of its proper divisors (25640847509).

72156504171 is a wasteful number, since it uses less digits than its factorization.

72156504171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46386.

The product of its (nonzero) digits is 58800, while the sum is 39.

The spelling of 72156504171 in words is "seventy-two billion, one hundred fifty-six million, five hundred four thousand, one hundred seventy-one".