72155188971 has 12 divisors (see below), whose sum is σ = 107586232000. Its totient is φ = 46551734640.

The previous prime is 72155188969. The next prime is 72155188997. The reversal of 72155188971 is 17988155127.

72155188971 is a `hidden beast` number, since 7 + 2 + 1 + 551 + 8 + 89 + 7 + 1 = 666.

It is not a de Polignac number, because 72155188971 - 2¹ = 72155188969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72155188901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 129310096 + ... + 129310653.

Almost surely, 2^72155188971 is an apocalyptic number.

72155188971 is a deficient number, since it is larger than the sum of its proper divisors (35431043029).

72155188971 is a wasteful number, since it uses less digits than its factorization.

72155188971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258620786 (or 258620783 counting only the distinct ones).

The product of its digits is 1411200, while the sum is 54.

The spelling of 72155188971 in words is "seventy-two billion, one hundred fifty-five million, one hundred eighty-eight thousand, nine hundred seventy-one".