638822052773 has 2 divisors, whose sum is σ = 638822052774. Its totient is φ = 638822052772.

The previous prime is 638822052761. The next prime is 638822052829. The reversal of 638822052773 is 377250228836.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 383350437409 + 255471615364 = 619153^2 + 505442^2 .

It is a cyclic number.

It is not a de Polignac number, because 638822052773 - 2²⁰ = 638821004197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638822052733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319411026386 + 319411026387.

It is an arithmetic number, because the mean of its divisors is an integer number (319411026387).

Almost surely, 2^638822052773 is an apocalyptic number.

It is an amenable number.

638822052773 is a deficient number, since it is larger than the sum of its proper divisors (1).

638822052773 is an equidigital number, since it uses as much as digits as its factorization.

638822052773 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6773760, while the sum is 53.

The spelling of 638822052773 in words is "six hundred thirty-eight billion, eight hundred twenty-two million, fifty-two thousand, seven hundred seventy-three".