72168239525 has 12 divisors (see below), whose sum is σ = 90374646084. Its totient is φ = 57162960000.

The previous prime is 72168239519. The next prime is 72168239551. The reversal of 72168239525 is 52593286127.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 2471183521 + 69697056004 = 49711^2 + 264002^2 .

It is not a de Polignac number, because 72168239525 - 2²⁸ = 71899804069 is a prime.

It is a super-2 number, since 2×72168239525² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14288216 + ... + 14293265.

It is an arithmetic number, because the mean of its divisors is an integer number (7531220507).

Almost surely, 2^72168239525 is an apocalyptic number.

It is an amenable number.

72168239525 is a deficient number, since it is larger than the sum of its proper divisors (18206406559).

72168239525 is a wasteful number, since it uses less digits than its factorization.

72168239525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28581592 (or 28581587 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 50.

The spelling of 72168239525 in words is "seventy-two billion, one hundred sixty-eight million, two hundred thirty-nine thousand, five hundred twenty-five".