639563260560 has 640 divisors, whose sum is σ = 2441843712000. Its totient is φ = 138035681280.

The previous prime is 639563260547. The next prime is 639563260663. The reversal of 639563260560 is 65062365936.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 721040437 + ... + 721041323.

It is an arithmetic number, because the mean of its divisors is an integer number (3815380800).

Almost surely, 2^639563260560 is an apocalyptic number.

639563260560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639563260560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1220921856000).

639563260560 is an abundant number, since it is smaller than the sum of its proper divisors (1802280451440).

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

639563260560 is a wasteful number, since it uses less digits than its factorization.

639563260560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1404 (or 1384 counting only the distinct ones).

The product of its (nonzero) digits is 5248800, while the sum is 51.

The spelling of 639563260560 in words is "six hundred thirty-nine billion, five hundred sixty-three million, two hundred sixty thousand, five hundred sixty".