19364643899 has 2 divisors, whose sum is σ = 19364643900. Its totient is φ = 19364643898.

The previous prime is 19364643869. The next prime is 19364643931. The reversal of 19364643899 is 99834646391.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19364643899 is a prime.

It is not a weakly prime, because it can be changed into another prime (19364643869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9682321949 + 9682321950.

It is an arithmetic number, because the mean of its divisors is an integer number (9682321950).

Almost surely, 2^19364643899 is an apocalyptic number.

19364643899 is a deficient number, since it is larger than the sum of its proper divisors (1).

19364643899 is an equidigital number, since it uses as much as digits as its factorization.

19364643899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30233088, while the sum is 62.

The spelling of 19364643899 in words is "nineteen billion, three hundred sixty-four million, six hundred forty-three thousand, eight hundred ninety-nine".