639733669700 has 36 divisors (see below), whose sum is σ = 1388999296272. Its totient is φ = 255750199200.

The previous prime is 639733669699. The next prime is 639733669727. The reversal of 639733669700 is 7966337936.

It is a self number, because there is not a number n which added to its sum of digits gives 639733669700.

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 11 ways as a sum of consecutive naturals, for example, 1611266 + ... + 1968665.

Almost surely, 2^639733669700 is an apocalyptic number.

It is an amenable number.

639733669700 is an abundant number, since it is smaller than the sum of its proper divisors (749265626572).

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

639733669700 is a wasteful number, since it uses less digits than its factorization.

639733669700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3581732 (or 3581725 counting only the distinct ones).

The product of its (nonzero) digits is 23147208, while the sum is 59.

The spelling of 639733669700 in words is "six hundred thirty-nine billion, seven hundred thirty-three million, six hundred sixty-nine thousand, seven hundred".