639948058651 has 12 divisors (see below), whose sum is σ = 733997201616. Its totient is φ = 556476570320.

The previous prime is 639948058637. The next prime is 639948058657. The reversal of 639948058651 is 156850849936.

It is not a de Polignac number, because 639948058651 - 2²⁷ = 639813840923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639948058657) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 114971716 + ... + 114977281.

It is an arithmetic number, because the mean of its divisors is an integer number (61166433468).

Almost surely, 2^639948058651 is an apocalyptic number.

639948058651 is a deficient number, since it is larger than the sum of its proper divisors (94049142965).

639948058651 is a wasteful number, since it uses less digits than its factorization.

639948058651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229949042 (or 229949031 counting only the distinct ones).

The product of its (nonzero) digits is 55987200, while the sum is 64.

The spelling of 639948058651 in words is "six hundred thirty-nine billion, nine hundred forty-eight million, fifty-eight thousand, six hundred fifty-one".