639943578624 has 176 divisors, whose sum is σ = 1950479856000. Its totient is φ = 182735241216.

The previous prime is 639943578583. The next prime is 639943578643. The reversal of 639943578624 is 426875349936.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 41903662 + ... + 41918930.

Almost surely, 2^639943578624 is an apocalyptic number.

639943578624 is a gapful number since it is divisible by the number (64) 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 639943578624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (975239928000).

639943578624 is an abundant number, since it is smaller than the sum of its proper divisors (1310536277376).

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

639943578624 is a wasteful number, since it uses less digits than its factorization.

639943578624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17248 (or 17230 counting only the distinct ones).

The product of its digits is 235146240, while the sum is 66.

The spelling of 639943578624 in words is "six hundred thirty-nine billion, nine hundred forty-three million, five hundred seventy-eight thousand, six hundred twenty-four".