3638634531839 has 2 divisors, whose sum is σ = 3638634531840. Its totient is φ = 3638634531838.

The previous prime is 3638634531811. The next prime is 3638634531841. The reversal of 3638634531839 is 9381354368363.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3638634531839 - 2²⁰ = 3638633483263 is a prime.

It is a super-2 number, since 2×3638634531839² (a number of 26 digits) contains 22 as substring.

Together with 3638634531841, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3638634531899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1819317265919 + 1819317265920.

It is an arithmetic number, because the mean of its divisors is an integer number (1819317265920).

Almost surely, 2^{3638634531839} is an apocalyptic number.

3638634531839 is a deficient number, since it is larger than the sum of its proper divisors (1).

3638634531839 is an equidigital number, since it uses as much as digits as its factorization.

3638634531839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100776960, while the sum is 62.

The spelling of 3638634531839 in words is "three trillion, six hundred thirty-eight billion, six hundred thirty-four million, five hundred thirty-one thousand, eight hundred thirty-nine".