639845523484 has 12 divisors (see below), whose sum is σ = 1122158584008. Its totient is φ = 319228785200.

The previous prime is 639845523469. The next prime is 639845523517. The reversal of 639845523484 is 484325548936.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173492062 + ... + 173495749.

It is an arithmetic number, because the mean of its divisors is an integer number (93513215334).

Almost surely, 2^639845523484 is an apocalyptic number.

It is an amenable number.

639845523484 is a deficient number, since it is larger than the sum of its proper divisors (482313060524).

639845523484 is a wasteful number, since it uses less digits than its factorization.

639845523484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346988276 (or 346988274 counting only the distinct ones).

The product of its digits is 99532800, while the sum is 61.

The spelling of 639845523484 in words is "six hundred thirty-nine billion, eight hundred forty-five million, five hundred twenty-three thousand, four hundred eighty-four".