638584701317 has 4 divisors (see below), whose sum is σ = 638593051296. Its totient is φ = 638576351340.

The previous prime is 638584701281. The next prime is 638584701323. The reversal of 638584701317 is 713107485836.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 638584701317 - 2⁸ = 638584701061 is a prime.

It is a super-2 number, since 2×638584701317² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638584701397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4059203 + ... + 4213584.

It is an arithmetic number, because the mean of its divisors is an integer number (159648262824).

Almost surely, 2^638584701317 is an apocalyptic number.

It is an amenable number.

638584701317 is a deficient number, since it is larger than the sum of its proper divisors (8349979).

638584701317 is an equidigital number, since it uses as much as digits as its factorization.

638584701317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8349978.

The product of its (nonzero) digits is 3386880, while the sum is 53.

The spelling of 638584701317 in words is "six hundred thirty-eight billion, five hundred eighty-four million, seven hundred one thousand, three hundred seventeen".