638650090807 has 2 divisors, whose sum is σ = 638650090808. Its totient is φ = 638650090806.

The previous prime is 638650090753. The next prime is 638650090811. The reversal of 638650090807 is 708090056836.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 638650090807 - 2¹⁹ = 638649566519 is a prime.

It is a super-2 number, since 2×638650090807² (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 (638650090007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319325045403 + 319325045404.

It is an arithmetic number, because the mean of its divisors is an integer number (319325045404).

Almost surely, 2^638650090807 is an apocalyptic number.

638650090807 is a deficient number, since it is larger than the sum of its proper divisors (1).

638650090807 is an equidigital number, since it uses as much as digits as its factorization.

638650090807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2177280, while the sum is 52.

The spelling of 638650090807 in words is "six hundred thirty-eight billion, six hundred fifty million, ninety thousand, eight hundred seven".