19797915519631 has 2 divisors, whose sum is σ = 19797915519632. Its totient is φ = 19797915519630.

The previous prime is 19797915519623. The next prime is 19797915519643. The reversal of 19797915519631 is 13691551979791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19797915519631 - 2³ = 19797915519623 is a prime.

It is a super-2 number, since 2×19797915519631² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19797915519601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9898957759815 + 9898957759816.

It is an arithmetic number, because the mean of its divisors is an integer number (9898957759816).

Almost surely, 2^{19797915519631} is an apocalyptic number.

19797915519631 is a deficient number, since it is larger than the sum of its proper divisors (1).

19797915519631 is an equidigital number, since it uses as much as digits as its factorization.

19797915519631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144670050, while the sum is 73.

The spelling of 19797915519631 in words is "nineteen trillion, seven hundred ninety-seven billion, nine hundred fifteen million, five hundred nineteen thousand, six hundred thirty-one".