638315996913 has 96 divisors (see below), whose sum is σ = 1131184947200. Its totient is φ = 348459037344.

The previous prime is 638315996911. The next prime is 638315996921. The reversal of 638315996913 is 319699513836.

638315996913 is a `hidden beast` number, since 6 + 3 + 8 + 31 + 599 + 6 + 9 + 1 + 3 = 666.

638315996913 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 638315996913 - 2¹ = 638315996911 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (638315996911) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 90679248 + ... + 90686286.

Almost surely, 2^638315996913 is an apocalyptic number.

638315996913 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

638315996913 is a deficient number, since it is larger than the sum of its proper divisors (492868950287).

638315996913 is a wasteful number, since it uses less digits than its factorization.

638315996913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8008 (or 7979 counting only the distinct ones).

The product of its digits is 28343520, while the sum is 63.

The spelling of 638315996913 in words is "six hundred thirty-eight billion, three hundred fifteen million, nine hundred ninety-six thousand, nine hundred thirteen".