72520056613 has 4 divisors (see below), whose sum is σ = 72526014540. Its totient is φ = 72514098688.

The previous prime is 72520056601. The next prime is 72520056617. The reversal of 72520056613 is 31665002527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31665002527 = 103 ⋅307427209.

It can be written as a sum of positive squares in 2 ways, for example, as 43985414529 + 28534642084 = 209727^2 + 168922^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72520056613 is a prime.

It is a super-2 number, since 2×72520056613² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72520056617) 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, 2960668 + ... + 2985061.

It is an arithmetic number, because the mean of its divisors is an integer number (18131503635).

Almost surely, 2^72520056613 is an apocalyptic number.

It is an amenable number.

72520056613 is a deficient number, since it is larger than the sum of its proper divisors (5957927).

72520056613 is a wasteful number, since it uses less digits than its factorization.

72520056613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5957926.

The product of its (nonzero) digits is 75600, while the sum is 37.

The spelling of 72520056613 in words is "seventy-two billion, five hundred twenty million, fifty-six thousand, six hundred thirteen".