72155666556986 has 32 divisors (see below), whose sum is σ = 119322162892800. Its totient is φ = 32572318149360.

The previous prime is 72155666556949. The next prime is 72155666557057. The reversal of 72155666556986 is 68965566655127.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152084126 + ... + 152557833.

It is an arithmetic number, because the mean of its divisors is an integer number (3728817590400).

Almost surely, 2^{72155666556986} is an apocalyptic number.

72155666556986 is a deficient number, since it is larger than the sum of its proper divisors (47166496335814).

72155666556986 is a wasteful number, since it uses less digits than its factorization.

72155666556986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304642274.

The product of its digits is 4898880000, while the sum is 77.

The spelling of 72155666556986 in words is "seventy-two trillion, one hundred fifty-five billion, six hundred sixty-six million, five hundred fifty-six thousand, nine hundred eighty-six".