638674788119 has 2 divisors, whose sum is σ = 638674788120. Its totient is φ = 638674788118.

The previous prime is 638674788029. The next prime is 638674788149. The reversal of 638674788119 is 911887476836.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638674788119 is a prime.

It is a super-2 number, since 2×638674788119² (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 (638674788149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319337394059 + 319337394060.

It is an arithmetic number, because the mean of its divisors is an integer number (319337394060).

Almost surely, 2^638674788119 is an apocalyptic number.

638674788119 is a deficient number, since it is larger than the sum of its proper divisors (1).

638674788119 is an equidigital number, since it uses as much as digits as its factorization.

638674788119 is an evil number, because the sum of its binary digits is even.

The product of its digits is 97542144, while the sum is 68.

The spelling of 638674788119 in words is "six hundred thirty-eight billion, six hundred seventy-four million, seven hundred eighty-eight thousand, one hundred nineteen".