72407553426621 has 128 divisors (see below), whose sum is σ = 133249698201600. Its totient is φ = 37922306595840.

The previous prime is 72407553426613. The next prime is 72407553426623. The reversal of 72407553426621 is 12662435570427.

72407553426621 is a `hidden beast` number, since 7 + 2 + 4 + 0 + 7 + 5 + 5 + 3 + 4 + 2 + 6 + 621 = 666.

It is not a de Polignac number, because 72407553426621 - 2³ = 72407553426613 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72407553426623) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 379843285 + ... + 380033861.

It is an arithmetic number, because the mean of its divisors is an integer number (1041013267200).

Almost surely, 2^{72407553426621} is an apocalyptic number.

It is an amenable number.

72407553426621 is a deficient number, since it is larger than the sum of its proper divisors (60842144774979).

72407553426621 is a wasteful number, since it uses less digits than its factorization.

72407553426621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194056 (or 194050 counting only the distinct ones).

The product of its (nonzero) digits is 16934400, while the sum is 54.

The spelling of 72407553426621 in words is "seventy-two trillion, four hundred seven billion, five hundred fifty-three million, four hundred twenty-six thousand, six hundred twenty-one".