639957706047 has 128 divisors (see below), whose sum is σ = 1112017766400. Its totient is φ = 359882265600.

The previous prime is 639957706043. The next prime is 639957706109. The reversal of 639957706047 is 740607759936.

It is not a de Polignac number, because 639957706047 - 2² = 639957706043 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639957706043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 32211897 + ... + 32231757.

It is an arithmetic number, because the mean of its divisors is an integer number (8687638800).

Almost surely, 2^639957706047 is an apocalyptic number.

639957706047 is a deficient number, since it is larger than the sum of its proper divisors (472060060353).

639957706047 is a wasteful number, since it uses less digits than its factorization.

639957706047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20046 (or 20040 counting only the distinct ones).

The product of its (nonzero) digits is 60011280, while the sum is 63.

The spelling of 639957706047 in words is "six hundred thirty-nine billion, nine hundred fifty-seven million, seven hundred six thousand, forty-seven".