639979642150 has 12 divisors (see below), whose sum is σ = 1190362134492. Its totient is φ = 255991856840.

The previous prime is 639979642103. The next prime is 639979642163. The reversal of 639979642150 is 51246979936.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6399796372 + ... + 6399796471.

It is an arithmetic number, because the mean of its divisors is an integer number (99196844541).

Almost surely, 2^639979642150 is an apocalyptic number.

639979642150 is a deficient number, since it is larger than the sum of its proper divisors (550382492342).

639979642150 is a wasteful number, since it uses less digits than its factorization.

639979642150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12799592855 (or 12799592850 counting only the distinct ones).

The product of its (nonzero) digits is 22044960, while the sum is 61.

The spelling of 639979642150 in words is "six hundred thirty-nine billion, nine hundred seventy-nine million, six hundred forty-two thousand, one hundred fifty".