72521564331 has 16 divisors (see below), whose sum is σ = 99824506880. Its totient is φ = 46783474560.

The previous prime is 72521564327. The next prime is 72521564389. The reversal of 72521564331 is 13346512527.

It is not a de Polignac number, because 72521564331 - 2² = 72521564327 is a prime.

It is a super-2 number, since 2×72521564331² (a number of 23 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 72521564331.

It is not an unprimeable number, because it can be changed into a prime (72521964331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1079010 + ... + 1144248.

It is an arithmetic number, because the mean of its divisors is an integer number (6239031680).

Almost surely, 2^72521564331 is an apocalyptic number.

72521564331 is a deficient number, since it is larger than the sum of its proper divisors (27302942549).

72521564331 is a wasteful number, since it uses less digits than its factorization.

72521564331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77226.

The product of its digits is 151200, while the sum is 39.

The spelling of 72521564331 in words is "seventy-two billion, five hundred twenty-one million, five hundred sixty-four thousand, three hundred thirty-one".