638657425133 has 16 divisors (see below), whose sum is σ = 786108508416. Its totient is φ = 505267269120.

The previous prime is 638657425103. The next prime is 638657425187. The reversal of 638657425133 is 331524756836.

It is a cyclic number.

It is not a de Polignac number, because 638657425133 - 2⁸ = 638657424877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638657425103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 762560 + ... + 1363382.

It is an arithmetic number, because the mean of its divisors is an integer number (49131781776).

Almost surely, 2^638657425133 is an apocalyptic number.

It is an amenable number.

638657425133 is a deficient number, since it is larger than the sum of its proper divisors (147451083283).

638657425133 is a wasteful number, since it uses less digits than its factorization.

638657425133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612524.

The product of its digits is 10886400, while the sum is 53.

The spelling of 638657425133 in words is "six hundred thirty-eight billion, six hundred fifty-seven million, four hundred twenty-five thousand, one hundred thirty-three".