638193756382 has 32 divisors (see below), whose sum is σ = 1195789012992. Its totient is φ = 248704007904.

The previous prime is 638193756379. The next prime is 638193756407. The reversal of 638193756382 is 283657391836.

It is a self number, because there is not a number n which added to its sum of digits gives 638193756382.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26156158 + ... + 26180545.

It is an arithmetic number, because the mean of its divisors is an integer number (37368406656).

Almost surely, 2^638193756382 is an apocalyptic number.

638193756382 is a deficient number, since it is larger than the sum of its proper divisors (557595256610).

638193756382 is a wasteful number, since it uses less digits than its factorization.

638193756382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52336792.

The product of its digits is 39191040, while the sum is 61.

The spelling of 638193756382 in words is "six hundred thirty-eight billion, one hundred ninety-three million, seven hundred fifty-six thousand, three hundred eighty-two".