72164524244531 has 4 divisors (see below), whose sum is σ = 72191065080000. Its totient is φ = 72137983409064.

The previous prime is 72164524244521. The next prime is 72164524244543. The reversal of 72164524244531 is 13544242546127.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72164524244531 - 2³⁰ = 72163450502707 is a prime.

It is a super-2 number, since 2×72164524244531² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72164524244531.

It is not an unprimeable number, because it can be changed into a prime (72164524244521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13270413656 + ... + 13270419093.

It is an arithmetic number, because the mean of its divisors is an integer number (18047766270000).

Almost surely, 2^{72164524244531} is an apocalyptic number.

72164524244531 is a deficient number, since it is larger than the sum of its proper divisors (26540835469).

72164524244531 is a wasteful number, since it uses less digits than its factorization.

72164524244531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26540835468.

The product of its digits is 6451200, while the sum is 50.

The spelling of 72164524244531 in words is "seventy-two trillion, one hundred sixty-four billion, five hundred twenty-four million, two hundred forty-four thousand, five hundred thirty-one".