638587073863 has 2 divisors, whose sum is σ = 638587073864. Its totient is φ = 638587073862.

The previous prime is 638587073849. The next prime is 638587073903. The reversal of 638587073863 is 368370785836.

638587073863 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638587073863 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 638587073795 and 638587073804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638587073843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319293536931 + 319293536932.

It is an arithmetic number, because the mean of its divisors is an integer number (319293536932).

Almost surely, 2^638587073863 is an apocalyptic number.

638587073863 is a deficient number, since it is larger than the sum of its proper divisors (1).

638587073863 is an equidigital number, since it uses as much as digits as its factorization.

638587073863 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 121927680, while the sum is 64.

The spelling of 638587073863 in words is "six hundred thirty-eight billion, five hundred eighty-seven million, seventy-three thousand, eight hundred sixty-three".