638863468037 has 2 divisors, whose sum is σ = 638863468038. Its totient is φ = 638863468036.

The previous prime is 638863468021. The next prime is 638863468057. The reversal of 638863468037 is 730864368836.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 621954626881 + 16908841156 = 788641^2 + 130034^2 .

It is a cyclic number.

It is not a de Polignac number, because 638863468037 - 2⁴ = 638863468021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638863468057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319431734018 + 319431734019.

It is an arithmetic number, because the mean of its divisors is an integer number (319431734019).

Almost surely, 2^638863468037 is an apocalyptic number.

It is an amenable number.

638863468037 is a deficient number, since it is larger than the sum of its proper divisors (1).

638863468037 is an equidigital number, since it uses as much as digits as its factorization.

638863468037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 83607552, while the sum is 62.

The spelling of 638863468037 in words is "six hundred thirty-eight billion, eight hundred sixty-three million, four hundred sixty-eight thousand, thirty-seven".