638691869119 has 2 divisors, whose sum is σ = 638691869120. Its totient is φ = 638691869118.

The previous prime is 638691869111. The next prime is 638691869131. The reversal of 638691869119 is 911968196836.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 638691869119 - 2³ = 638691869111 is a prime.

It is a super-2 number, since 2×638691869119² (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 (638691869111) 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, 319345934559 + 319345934560.

It is an arithmetic number, because the mean of its divisors is an integer number (319345934560).

Almost surely, 2^638691869119 is an apocalyptic number.

638691869119 is a deficient number, since it is larger than the sum of its proper divisors (1).

638691869119 is an equidigital number, since it uses as much as digits as its factorization.

638691869119 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30233088, while the sum is 67.

The spelling of 638691869119 in words is "six hundred thirty-eight billion, six hundred ninety-one million, eight hundred sixty-nine thousand, one hundred nineteen".