638840760223 has 2 divisors, whose sum is σ = 638840760224. Its totient is φ = 638840760222.

The previous prime is 638840760169. The next prime is 638840760253. The reversal of 638840760223 is 322067048836.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 638840760223 - 2³⁷ = 501401806751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638840760253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319420380111 + 319420380112.

It is an arithmetic number, because the mean of its divisors is an integer number (319420380112).

Almost surely, 2^638840760223 is an apocalyptic number.

638840760223 is a deficient number, since it is larger than the sum of its proper divisors (1).

638840760223 is an equidigital number, since it uses as much as digits as its factorization.

638840760223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2322432, while the sum is 49.

The spelling of 638840760223 in words is "six hundred thirty-eight billion, eight hundred forty million, seven hundred sixty thousand, two hundred twenty-three".