638822426057 has 2 divisors, whose sum is σ = 638822426058. Its totient is φ = 638822426056.

The previous prime is 638822425999. The next prime is 638822426063. The reversal of 638822426057 is 750624228836.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 627737705401 + 11084720656 = 792299^2 + 105284^2 .

It is a cyclic number.

It is not a de Polignac number, because 638822426057 - 2¹⁸ = 638822163913 is a prime.

It is not a weakly prime, because it can be changed into another prime (638822426087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319411213028 + 319411213029.

It is an arithmetic number, because the mean of its divisors is an integer number (319411213029).

Almost surely, 2^638822426057 is an apocalyptic number.

It is an amenable number.

638822426057 is a deficient number, since it is larger than the sum of its proper divisors (1).

638822426057 is an equidigital number, since it uses as much as digits as its factorization.

638822426057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7741440, while the sum is 53.

The spelling of 638822426057 in words is "six hundred thirty-eight billion, eight hundred twenty-two million, four hundred twenty-six thousand, fifty-seven".