638193751382 has 8 divisors (see below), whose sum is σ = 1044317047752. Its totient is φ = 290088068800.

The previous prime is 638193751309. The next prime is 638193751411. The reversal of 638193751382 is 283157391836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14504403419 + ... + 14504403462.

It is an arithmetic number, because the mean of its divisors is an integer number (130539630969).

Almost surely, 2^638193751382 is an apocalyptic number.

638193751382 is a deficient number, since it is larger than the sum of its proper divisors (406123296370).

638193751382 is a wasteful number, since it uses less digits than its factorization.

638193751382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29008806894.

The product of its digits is 6531840, while the sum is 56.

The spelling of 638193751382 in words is "six hundred thirty-eight billion, one hundred ninety-three million, seven hundred fifty-one thousand, three hundred eighty-two".