72809575525 has 6 divisors (see below), whose sum is σ = 90283873682. Its totient is φ = 58247660400.

The previous prime is 72809575511. The next prime is 72809575541. The reversal of 72809575525 is 52557590827.

It can be written as a sum of positive squares in 3 ways, for example, as 24777593281 + 48031982244 = 157409^2 + 219162^2 .

It is a de Polignac number, because none of the positive numbers 2^k-72809575525 is a prime.

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 5 ways as a sum of consecutive naturals, for example, 1456191486 + ... + 1456191535.

Almost surely, 2^72809575525 is an apocalyptic number.

It is an amenable number.

72809575525 is a deficient number, since it is larger than the sum of its proper divisors (17474298157).

72809575525 is a wasteful number, since it uses less digits than its factorization.

72809575525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2912383031 (or 2912383026 counting only the distinct ones).

The product of its (nonzero) digits is 8820000, while the sum is 55.

The spelling of 72809575525 in words is "seventy-two billion, eight hundred nine million, five hundred seventy-five thousand, five hundred twenty-five".