638583223156 has 36 divisors (see below), whose sum is σ = 1187349200100. Its totient is φ = 300456576000.

The previous prime is 638583223139. The next prime is 638583223189. The reversal of 638583223156 is 651322385836.

638583223156 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 215453788900 + 423129434256 = 464170^2 + 650484^2 .

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

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, 1268845 + ... + 1699156.

It is an arithmetic number, because the mean of its divisors is an integer number (32981922225).

Almost surely, 2^638583223156 is an apocalyptic number.

It is an amenable number.

638583223156 is a deficient number, since it is larger than the sum of its proper divisors (548765976944).

638583223156 is a wasteful number, since it uses less digits than its factorization.

638583223156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2968192 (or 2968171 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 52.

The spelling of 638583223156 in words is "six hundred thirty-eight billion, five hundred eighty-three million, two hundred twenty-three thousand, one hundred fifty-six".