639814674398 has 8 divisors (see below), whose sum is σ = 959799215592. Its totient is φ = 319881602536.

The previous prime is 639814674361. The next prime is 639814674427. The reversal of 639814674398 is 893476418936.

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

It is a congruent 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, 12836240 + ... + 12885987.

It is an arithmetic number, because the mean of its divisors is an integer number (119974901949).

Almost surely, 2^639814674398 is an apocalyptic number.

639814674398 is a deficient number, since it is larger than the sum of its proper divisors (319984541194).

639814674398 is a wasteful number, since it uses less digits than its factorization.

639814674398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25734666.

The product of its digits is 188116992, while the sum is 68.

The spelling of 639814674398 in words is "six hundred thirty-nine billion, eight hundred fourteen million, six hundred seventy-four thousand, three hundred ninety-eight".