638349865033 has 2 divisors, whose sum is σ = 638349865034. Its totient is φ = 638349865032.

The previous prime is 638349865009. The next prime is 638349865051. The reversal of 638349865033 is 330568943836.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 638349865024 + 9 = 798968^2 + 3^2 .

It is a cyclic number.

It is not a de Polignac number, because 638349865033 - 2⁵ = 638349865001 is a prime.

It is not a weakly prime, because it can be changed into another prime (638349865073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319174932516 + 319174932517.

It is an arithmetic number, because the mean of its divisors is an integer number (319174932517).

Almost surely, 2^638349865033 is an apocalyptic number.

It is an amenable number.

638349865033 is a deficient number, since it is larger than the sum of its proper divisors (1).

638349865033 is an equidigital number, since it uses as much as digits as its factorization.

638349865033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33592320, while the sum is 58.

The spelling of 638349865033 in words is "six hundred thirty-eight billion, three hundred forty-nine million, eight hundred sixty-five thousand, thirty-three".