72155507667 has 16 divisors (see below), whose sum is σ = 97172544000. Its totient is φ = 47621196000.

The previous prime is 72155507663. The next prime is 72155507687. The reversal of 72155507667 is 76670555127.

It is not a de Polignac number, because 72155507667 - 2² = 72155507663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72155507663) 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, 4233192 + ... + 4250202.

It is an arithmetic number, because the mean of its divisors is an integer number (6073284000).

Almost surely, 2^72155507667 is an apocalyptic number.

72155507667 is a deficient number, since it is larger than the sum of its proper divisors (25017036333).

72155507667 is a wasteful number, since it uses less digits than its factorization.

72155507667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31114.

The product of its (nonzero) digits is 3087000, while the sum is 51.

The spelling of 72155507667 in words is "seventy-two billion, one hundred fifty-five million, five hundred seven thousand, six hundred sixty-seven".