638653428713 has 2 divisors, whose sum is σ = 638653428714. Its totient is φ = 638653428712.

The previous prime is 638653428697. The next prime is 638653428793. The reversal of 638653428713 is 317824356836.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 537658495504 + 100994933209 = 733252^2 + 317797^2 .

It is a cyclic number.

It is not a de Polignac number, because 638653428713 - 2⁴ = 638653428697 is a prime.

It is not a weakly prime, because it can be changed into another prime (638653428793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319326714356 + 319326714357.

It is an arithmetic number, because the mean of its divisors is an integer number (319326714357).

Almost surely, 2^638653428713 is an apocalyptic number.

It is an amenable number.

638653428713 is a deficient number, since it is larger than the sum of its proper divisors (1).

638653428713 is an equidigital number, since it uses as much as digits as its factorization.

638653428713 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17418240, while the sum is 56.

The spelling of 638653428713 in words is "six hundred thirty-eight billion, six hundred fifty-three million, four hundred twenty-eight thousand, seven hundred thirteen".