639369325506 has 8 divisors (see below), whose sum is σ = 1278738651024. Its totient is φ = 213123108500.

The previous prime is 639369325433. The next prime is 639369325531. The reversal of 639369325506 is 605523963936.

639369325506 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

639369325506 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53280777120 + ... + 53280777131.

It is an arithmetic number, because the mean of its divisors is an integer number (159842331378).

Almost surely, 2^639369325506 is an apocalyptic number.

639369325506 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

639369325506 is a wasteful number, since it uses less digits than its factorization.

639369325506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106561554256.

The product of its (nonzero) digits is 23619600, while the sum is 57.

The spelling of 639369325506 in words is "six hundred thirty-nine billion, three hundred sixty-nine million, three hundred twenty-five thousand, five hundred six".