638489740411 has 2 divisors, whose sum is σ = 638489740412. Its totient is φ = 638489740410.

The previous prime is 638489740373. The next prime is 638489740433. The reversal of 638489740411 is 114047984836.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 638489740411 - 2²³ = 638481351803 is a prime.

It is a super-2 number, since 2×638489740411² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (638489740451) 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, 319244870205 + 319244870206.

It is an arithmetic number, because the mean of its divisors is an integer number (319244870206).

Almost surely, 2^638489740411 is an apocalyptic number.

638489740411 is a deficient number, since it is larger than the sum of its proper divisors (1).

638489740411 is an equidigital number, since it uses as much as digits as its factorization.

638489740411 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4644864, while the sum is 55.

The spelling of 638489740411 in words is "six hundred thirty-eight billion, four hundred eighty-nine million, seven hundred forty thousand, four hundred eleven".