639800521113553 has 2 divisors, whose sum is σ = 639800521113554. Its totient is φ = 639800521113552.

The previous prime is 639800521113541. The next prime is 639800521113641. The reversal of 639800521113553 is 355311125008936.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 335411679805504 + 304388841308049 = 18314248^2 + 17446743^2 .

It is a cyclic number.

It is not a de Polignac number, because 639800521113553 - 2¹⁷ = 639800520982481 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 639800521113553.

It is not a weakly prime, because it can be changed into another prime (639800521113353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319900260556776 + 319900260556777.

It is an arithmetic number, because the mean of its divisors is an integer number (319900260556777).

Almost surely, 2^{639800521113553} is an apocalyptic number.

It is an amenable number.

639800521113553 is a deficient number, since it is larger than the sum of its proper divisors (1).

639800521113553 is an equidigital number, since it uses as much as digits as its factorization.

639800521113553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916000, while the sum is 52.

The spelling of 639800521113553 in words is "six hundred thirty-nine trillion, eight hundred billion, five hundred twenty-one million, one hundred thirteen thousand, five hundred fifty-three".