638822052749 has 2 divisors, whose sum is σ = 638822052750. Its totient is φ = 638822052748.

The previous prime is 638822052733. The next prime is 638822052761. The reversal of 638822052749 is 947250228836.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 588772309225 + 50049743524 = 767315^2 + 223718^2 .

It is a cyclic number.

It is not a de Polignac number, because 638822052749 - 2⁴ = 638822052733 is a prime.

It is a super-2 number, since 2×638822052749² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 638822052694 and 638822052703.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638822252749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319411026374 + 319411026375.

It is an arithmetic number, because the mean of its divisors is an integer number (319411026375).

Almost surely, 2^638822052749 is an apocalyptic number.

It is an amenable number.

638822052749 is a deficient number, since it is larger than the sum of its proper divisors (1).

638822052749 is an equidigital number, since it uses as much as digits as its factorization.

638822052749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11612160, while the sum is 56.

The spelling of 638822052749 in words is "six hundred thirty-eight billion, eight hundred twenty-two million, fifty-two thousand, seven hundred forty-nine".