638822048797 has 2 divisors, whose sum is σ = 638822048798. Its totient is φ = 638822048796.

The previous prime is 638822048651. The next prime is 638822048803. The reversal of 638822048797 is 797840228836.

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., 634625729956 + 4196318841 = 796634^2 + 64779^2 .

It is a cyclic number.

It is not a de Polignac number, because 638822048797 - 2²⁷ = 638687831069 is a prime.

It is a super-2 number, since 2×638822048797² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638822048597) 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, 319411024398 + 319411024399.

It is an arithmetic number, because the mean of its divisors is an integer number (319411024399).

Almost surely, 2^638822048797 is an apocalyptic number.

It is an amenable number.

638822048797 is a deficient number, since it is larger than the sum of its proper divisors (1).

638822048797 is an equidigital number, since it uses as much as digits as its factorization.

638822048797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 65028096, while the sum is 64.

The spelling of 638822048797 in words is "six hundred thirty-eight billion, eight hundred twenty-two million, forty-eight thousand, seven hundred ninety-seven".