638357623774 has 12 divisors (see below), whose sum is σ = 1036858981176. Its totient is φ = 294626595432.

The previous prime is 638357623723. The next prime is 638357623801. The reversal of 638357623774 is 477326753836.

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, 944315674 + ... + 944316349.

It is an arithmetic number, because the mean of its divisors is an integer number (86404915098).

Almost surely, 2^638357623774 is an apocalyptic number.

638357623774 is a deficient number, since it is larger than the sum of its proper divisors (398501357402).

638357623774 is a wasteful number, since it uses less digits than its factorization.

638357623774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1888632051 (or 1888632038 counting only the distinct ones).

The product of its digits is 106686720, while the sum is 61.

The spelling of 638357623774 in words is "six hundred thirty-eight billion, three hundred fifty-seven million, six hundred twenty-three thousand, seven hundred seventy-four".