639557943360 has 112 divisors (see below), whose sum is σ = 2320681704576. Its totient is φ = 146184671232.

The previous prime is 639557943329. The next prime is 639557943383. The reversal of 639557943360 is 63349755936.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a junction number, because it is equal to n+sod(n) for n = 639557943294 and 639557943303.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47579437 + ... + 47592876.

Almost surely, 2^639557943360 is an apocalyptic number.

639557943360 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

639557943360 is an abundant number, since it is smaller than the sum of its proper divisors (1681123761216).

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

639557943360 is a wasteful number, since it uses less digits than its factorization.

639557943360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95172340 (or 95172330 counting only the distinct ones).

The product of its (nonzero) digits is 55112400, while the sum is 60.

The spelling of 639557943360 in words is "six hundred thirty-nine billion, five hundred fifty-seven million, nine hundred forty-three thousand, three hundred sixty".