638582804851 has 32 divisors (see below), whose sum is σ = 715505918400. Its totient is φ = 567071232000.

The previous prime is 638582804819. The next prime is 638582804861. The reversal of 638582804851 is 158408285836.

It is a cyclic number.

It is not a de Polignac number, because 638582804851 - 2⁵ = 638582804819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638582804861) by changing a digit.

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 in 31 ways as a sum of consecutive naturals, for example, 6509695 + ... + 6607063.

It is an arithmetic number, because the mean of its divisors is an integer number (22359559950).

Almost surely, 2^638582804851 is an apocalyptic number.

638582804851 is a deficient number, since it is larger than the sum of its proper divisors (76923113549).

638582804851 is a wasteful number, since it uses less digits than its factorization.

638582804851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97719.

The product of its (nonzero) digits is 14745600, while the sum is 58.

The spelling of 638582804851 in words is "six hundred thirty-eight billion, five hundred eighty-two million, eight hundred four thousand, eight hundred fifty-one".