72155612106128 has 40 divisors (see below), whose sum is σ = 143581755021048. Its totient is φ = 35102280932352.

The previous prime is 72155612106043. The next prime is 72155612106131. The reversal of 72155612106128 is 82160121655127.

It can be written as a sum of positive squares in 4 ways, for example, as 3012196282624 + 69143415823504 = 1735568^2 + 8315252^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48097100 + ... + 49574612.

Almost surely, 2^{72155612106128} is an apocalyptic number.

It is an amenable number.

72155612106128 is a deficient number, since it is larger than the sum of its proper divisors (71426142914920).

72155612106128 is a wasteful number, since it uses less digits than its factorization.

72155612106128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560051 (or 1560045 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 47.

The spelling of 72155612106128 in words is "seventy-two trillion, one hundred fifty-five billion, six hundred twelve million, one hundred six thousand, one hundred twenty-eight".