19398669137 has 2 divisors, whose sum is σ = 19398669138. Its totient is φ = 19398669136.

The previous prime is 19398669119. The next prime is 19398669139. The reversal of 19398669137 is 73196689391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19342133776 + 56535361 = 139076^2 + 7519^2 .

It is a cyclic number.

It is not a de Polignac number, because 19398669137 - 2⁸ = 19398668881 is a prime.

Together with 19398669139, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19398669137.

It is not a weakly prime, because it can be changed into another prime (19398669139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9699334568 + 9699334569.

It is an arithmetic number, because the mean of its divisors is an integer number (9699334569).

Almost surely, 2^19398669137 is an apocalyptic number.

It is an amenable number.

19398669137 is a deficient number, since it is larger than the sum of its proper divisors (1).

19398669137 is an equidigital number, since it uses as much as digits as its factorization.

19398669137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13226976, while the sum is 62.

The spelling of 19398669137 in words is "nineteen billion, three hundred ninety-eight million, six hundred sixty-nine thousand, one hundred thirty-seven".