638376533776 has 10 divisors (see below), whose sum is σ = 1236854534222. Its totient is φ = 319188266880.

The previous prime is 638376533701. The next prime is 638376533791. The reversal of 638376533776 is 677335673836.

It can be written as a sum of positive squares in only one way, i.e., 367143893776 + 271232640000 = 605924^2 + 520800^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19949266665 + ... + 19949266696.

Almost surely, 2^638376533776 is an apocalyptic number.

It is an amenable number.

638376533776 is a deficient number, since it is larger than the sum of its proper divisors (598478000446).

638376533776 is a wasteful number, since it uses less digits than its factorization.

638376533776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39898533369 (or 39898533363 counting only the distinct ones).

The product of its digits is 240045120, while the sum is 64.

The spelling of 638376533776 in words is "six hundred thirty-eight billion, three hundred seventy-six million, five hundred thirty-three thousand, seven hundred seventy-six".