639359586923 has 2 divisors, whose sum is σ = 639359586924. Its totient is φ = 639359586922.

The previous prime is 639359586851. The next prime is 639359586959. The reversal of 639359586923 is 329685953936.

639359586923 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 639359586923 - 2²² = 639355392619 is a prime.

It is not a weakly prime, because it can be changed into another prime (639359586623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319679793461 + 319679793462.

It is an arithmetic number, because the mean of its divisors is an integer number (319679793462).

Almost surely, 2^639359586923 is an apocalyptic number.

639359586923 is a deficient number, since it is larger than the sum of its proper divisors (1).

639359586923 is an equidigital number, since it uses as much as digits as its factorization.

639359586923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 283435200, while the sum is 68.

The spelling of 639359586923 in words is "six hundred thirty-nine billion, three hundred fifty-nine million, five hundred eighty-six thousand, nine hundred twenty-three".