639521114904 has 384 divisors, whose sum is σ = 2209594982400. Its totient is φ = 162880450560.

The previous prime is 639521114879. The next prime is 639521114957. The reversal of 639521114904 is 409411125936.

639521114904 is a `hidden beast` number, since 6 + 3 + 9 + 521 + 114 + 9 + 0 + 4 = 666.

639521114904 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 639521114904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 12457962 + ... + 12509190.

It is an arithmetic number, because the mean of its divisors is an integer number (5754153600).

Almost surely, 2^639521114904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639521114904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1104797491200).

639521114904 is an abundant number, since it is smaller than the sum of its proper divisors (1570073867496).

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

639521114904 is a wasteful number, since it uses less digits than its factorization.

639521114904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51343 (or 51336 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 639521114904 in words is "six hundred thirty-nine billion, five hundred twenty-one million, one hundred fourteen thousand, nine hundred four".