72155106613 has 4 divisors (see below), whose sum is σ = 72164508268. Its totient is φ = 72145704960.

The previous prime is 72155106601. The next prime is 72155106623. The reversal of 72155106613 is 31660155127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31660155127 = 160709 ⋅197003.

It can be written as a sum of positive squares in 2 ways, for example, as 50610151089 + 21544955524 = 224967^2 + 146782^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72155106613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72155106623) 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, 4689306 + ... + 4704667.

It is an arithmetic number, because the mean of its divisors is an integer number (18041127067).

Almost surely, 2^72155106613 is an apocalyptic number.

It is an amenable number.

72155106613 is a deficient number, since it is larger than the sum of its proper divisors (9401655).

72155106613 is an equidigital number, since it uses as much as digits as its factorization.

72155106613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9401654.

The product of its (nonzero) digits is 37800, while the sum is 37.

The spelling of 72155106613 in words is "seventy-two billion, one hundred fifty-five million, one hundred six thousand, six hundred thirteen".