638193751411 has 2 divisors, whose sum is σ = 638193751412. Its totient is φ = 638193751410.

The previous prime is 638193751309. The next prime is 638193751427. The reversal of 638193751411 is 114157391836.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638193751411 is a prime.

It is not a weakly prime, because it can be changed into another prime (638193751441) 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, 319096875705 + 319096875706.

It is an arithmetic number, because the mean of its divisors is an integer number (319096875706).

Almost surely, 2^638193751411 is an apocalyptic number.

638193751411 is a deficient number, since it is larger than the sum of its proper divisors (1).

638193751411 is an equidigital number, since it uses as much as digits as its factorization.

638193751411 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 49.

The spelling of 638193751411 in words is "six hundred thirty-eight billion, one hundred ninety-three million, seven hundred fifty-one thousand, four hundred eleven".