638437420593 has 48 divisors (see below), whose sum is σ = 1088118194176. Its totient is φ = 352990625760.

The previous prime is 638437420567. The next prime is 638437420609. The reversal of 638437420593 is 395024734836.

638437420593 is a `hidden beast` number, since 6 + 3 + 8 + 4 + 3 + 7 + 42 + 0 + 593 = 666.

It is not a de Polignac number, because 638437420593 - 2¹⁸ = 638437158449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638437420493) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12409080 + ... + 12460422.

Almost surely, 2^638437420593 is an apocalyptic number.

638437420593 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

638437420593 is a deficient number, since it is larger than the sum of its proper divisors (449680773583).

638437420593 is a wasteful number, since it uses less digits than its factorization.

638437420593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57754 (or 57751 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 54.

The spelling of 638437420593 in words is "six hundred thirty-eight billion, four hundred thirty-seven million, four hundred twenty thousand, five hundred ninety-three".