639633430950 has 48 divisors (see below), whose sum is σ = 1612295700816. Its totient is φ = 167772700800.

The previous prime is 639633430913. The next prime is 639633430951. The reversal of 639633430950 is 59034336936.

It is a junction number, because it is equal to n+sod(n) for n = 639633430893 and 639633430902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639633430951) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34943497 + ... + 34961796.

It is an arithmetic number, because the mean of its divisors is an integer number (33589493767).

Almost surely, 2^639633430950 is an apocalyptic number.

639633430950 is an abundant number, since it is smaller than the sum of its proper divisors (972662269866).

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

639633430950 is a wasteful number, since it uses less digits than its factorization.

639633430950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69905369 (or 69905364 counting only the distinct ones).

The product of its (nonzero) digits is 4723920, while the sum is 51.

The spelling of 639633430950 in words is "six hundred thirty-nine billion, six hundred thirty-three million, four hundred thirty thousand, nine hundred fifty".