638374637663 has 16 divisors (see below), whose sum is σ = 736474788864. Its totient is φ = 542001616800.

The previous prime is 638374637597. The next prime is 638374637671. The reversal of 638374637663 is 366736473836.

638374637663 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 638374637663 - 2¹⁸ = 638374375519 is a prime.

It is a super-2 number, since 2×638374637663² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 638374637596 and 638374637605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638374637683) 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, 7109081 + ... + 7198317.

It is an arithmetic number, because the mean of its divisors is an integer number (46029674304).

Almost surely, 2^638374637663 is an apocalyptic number.

638374637663 is a deficient number, since it is larger than the sum of its proper divisors (98100151201).

638374637663 is a wasteful number, since it uses less digits than its factorization.

638374637663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98902.

The product of its digits is 164602368, while the sum is 62.

The spelling of 638374637663 in words is "six hundred thirty-eight billion, three hundred seventy-four million, six hundred thirty-seven thousand, six hundred sixty-three".