638005000957 has 2 divisors, whose sum is σ = 638005000958. Its totient is φ = 638005000956.

The previous prime is 638005000949. The next prime is 638005000991. The reversal of 638005000957 is 759000500836.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 596580132996 + 41424867961 = 772386^2 + 203531^2 .

It is a cyclic number.

It is not a de Polignac number, because 638005000957 - 2³ = 638005000949 is a prime.

It is a super-2 number, since 2×638005000957² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638005000907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319002500478 + 319002500479.

It is an arithmetic number, because the mean of its divisors is an integer number (319002500479).

Almost surely, 2^638005000957 is an apocalyptic number.

It is an amenable number.

638005000957 is a deficient number, since it is larger than the sum of its proper divisors (1).

638005000957 is an equidigital number, since it uses as much as digits as its factorization.

638005000957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226800, while the sum is 43.

The spelling of 638005000957 in words is "six hundred thirty-eight billion, five million, nine hundred fifty-seven", and thus it is an aban number.