19864636811 has 2 divisors, whose sum is σ = 19864636812. Its totient is φ = 19864636810.

The previous prime is 19864636789. The next prime is 19864636823. The reversal of 19864636811 is 11863646891.

It is a strong prime.

It is an emirp because it is prime and its reverse (11863646891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19864636811 - 2³⁴ = 2684767627 is a prime.

It is not a weakly prime, because it can be changed into another prime (19864636861) 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, 9932318405 + 9932318406.

It is an arithmetic number, because the mean of its divisors is an integer number (9932318406).

Almost surely, 2^19864636811 is an apocalyptic number.

19864636811 is a deficient number, since it is larger than the sum of its proper divisors (1).

19864636811 is an equidigital number, since it uses as much as digits as its factorization.

19864636811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1492992, while the sum is 53.

The spelling of 19864636811 in words is "nineteen billion, eight hundred sixty-four million, six hundred thirty-six thousand, eight hundred eleven".