56638420173 has 12 divisors (see below), whose sum is σ = 81823959360. Its totient is φ = 37752989256.

The previous prime is 56638420109. The next prime is 56638420219. The reversal of 56638420173 is 37102483665.

56638420173 is a `hidden beast` number, since 5 + 6 + 638 + 4 + 2 + 0 + 1 + 7 + 3 = 666.

It is not a de Polignac number, because 56638420173 - 2⁶ = 56638420109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56638420973) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 435861 + ... + 550682.

It is an arithmetic number, because the mean of its divisors is an integer number (6818663280).

Almost surely, 2^56638420173 is an apocalyptic number.

It is an amenable number.

56638420173 is a deficient number, since it is larger than the sum of its proper divisors (25185539187).

56638420173 is a wasteful number, since it uses less digits than its factorization.

56638420173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 992928 (or 992925 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The spelling of 56638420173 in words is "fifty-six billion, six hundred thirty-eight million, four hundred twenty thousand, one hundred seventy-three".