638108711859 has 16 divisors (see below), whose sum is σ = 857572015104. Its totient is φ = 422033016000.

The previous prime is 638108711857. The next prime is 638108711873. The reversal of 638108711859 is 958117801836.

It is not a de Polignac number, because 638108711859 - 2¹ = 638108711857 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 638108711799 and 638108711808.

It is not an unprimeable number, because it can be changed into a prime (638108711857) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 580779 + ... + 1270244.

It is an arithmetic number, because the mean of its divisors is an integer number (53598250944).

Almost surely, 2^638108711859 is an apocalyptic number.

638108711859 is a deficient number, since it is larger than the sum of its proper divisors (219463303245).

638108711859 is a wasteful number, since it uses less digits than its factorization.

638108711859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1851938.

The product of its (nonzero) digits is 2903040, while the sum is 57.

The spelling of 638108711859 in words is "six hundred thirty-eight billion, one hundred eight million, seven hundred eleven thousand, eight hundred fifty-nine".