638762631950 has 12 divisors (see below), whose sum is σ = 1188098495520. Its totient is φ = 255505052760.

The previous prime is 638762631887. The next prime is 638762631961. The reversal of 638762631950 is 59136267836.

It is a hoax number, since the sum of its digits (56) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6387626270 + ... + 6387626369.

It is an arithmetic number, because the mean of its divisors is an integer number (99008207960).

Almost surely, 2^638762631950 is an apocalyptic number.

638762631950 is a deficient number, since it is larger than the sum of its proper divisors (549335863570).

638762631950 is a wasteful number, since it uses less digits than its factorization.

638762631950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12775252651 (or 12775252646 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 56.

The spelling of 638762631950 in words is "six hundred thirty-eight billion, seven hundred sixty-two million, six hundred thirty-one thousand, nine hundred fifty".