72172651536656 has 40 divisors (see below), whose sum is σ = 153085775273184. Its totient is φ = 32689829295360.

The previous prime is 72172651536599. The next prime is 72172651536721. The reversal of 72172651536656 is 65663515627127.

It is a super-2 number, since 2×72172651536656² (a number of 29 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 724458821 + ... + 724558436.

Almost surely, 2^{72172651536656} is an apocalyptic number.

It is an amenable number.

72172651536656 is an abundant number, since it is smaller than the sum of its proper divisors (80913123736528).

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

72172651536656 is a wasteful number, since it uses less digits than its factorization.

72172651536656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1449017559 (or 1449017553 counting only the distinct ones).

The product of its digits is 95256000, while the sum is 62.

The spelling of 72172651536656 in words is "seventy-two trillion, one hundred seventy-two billion, six hundred fifty-one million, five hundred thirty-six thousand, six hundred fifty-six".