638599254117 has 32 divisors (see below), whose sum is σ = 942848309760. Its totient is φ = 381207625920.

The previous prime is 638599254113. The next prime is 638599254127. The reversal of 638599254117 is 711452995836.

It is a happy number.

It is not a de Polignac number, because 638599254117 - 2² = 638599254113 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638599254113) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31127259 + ... + 31147767.

It is an arithmetic number, because the mean of its divisors is an integer number (29464009680).

Almost surely, 2^638599254117 is an apocalyptic number.

638599254117 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

638599254117 is a deficient number, since it is larger than the sum of its proper divisors (304249055643).

638599254117 is a wasteful number, since it uses less digits than its factorization.

638599254117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34673.

The product of its digits is 16329600, while the sum is 60.

The spelling of 638599254117 in words is "six hundred thirty-eight billion, five hundred ninety-nine million, two hundred fifty-four thousand, one hundred seventeen".