639900791712 has 144 divisors (see below), whose sum is σ = 2239652862720. Its totient is φ = 168765037056.

The previous prime is 639900791683. The next prime is 639900791749. The reversal of 639900791712 is 217197009936.

It is a happy number.

639900791712 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (144).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12181912 + ... + 12234327.

It is an arithmetic number, because the mean of its divisors is an integer number (15553144880).

Almost surely, 2^639900791712 is an apocalyptic number.

It is an amenable number.

639900791712 is an abundant number, since it is smaller than the sum of its proper divisors (1599752071008).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

639900791712 is a wasteful number, since it uses less digits than its factorization.

639900791712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24416275 (or 24416264 counting only the distinct ones).

The product of its (nonzero) digits is 1285956, while the sum is 54.

The spelling of 639900791712 in words is "six hundred thirty-nine billion, nine hundred million, seven hundred ninety-one thousand, seven hundred twelve".