18396686887211 has 2 divisors, whose sum is σ = 18396686887212. Its totient is φ = 18396686887210.

The previous prime is 18396686887153. The next prime is 18396686887219. The reversal of 18396686887211 is 11278868669381.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18396686887211 - 2²² = 18396682692907 is a prime.

It is not a weakly prime, because it can be changed into another prime (18396686887219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9198343443605 + 9198343443606.

It is an arithmetic number, because the mean of its divisors is an integer number (9198343443606).

Almost surely, 2^{18396686887211} is an apocalyptic number.

18396686887211 is a deficient number, since it is larger than the sum of its proper divisors (1).

18396686887211 is an equidigital number, since it uses as much as digits as its factorization.

18396686887211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 334430208, while the sum is 74.

The spelling of 18396686887211 in words is "eighteen trillion, three hundred ninety-six billion, six hundred eighty-six million, eight hundred eighty-seven thousand, two hundred eleven".