18168811 has 2 divisors, whose sum is σ = 18168812. Its totient is φ = 18168810.

The previous prime is 18168793. The next prime is 18168817. The reversal of 18168811 is 11886181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18168811 - 2⁹ = 18168299 is a prime.

It is not a weakly prime, because it can be changed into another prime (18168817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9084405 + 9084406.

It is an arithmetic number, because the mean of its divisors is an integer number (9084406).

Almost surely, 2^18168811 is an apocalyptic number.

18168811 is a deficient number, since it is larger than the sum of its proper divisors (1).

18168811 is an equidigital number, since it uses as much as digits as its factorization.

18168811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3072, while the sum is 34.

The square root of 18168811 is about 4262.4888269648. The cubic root of 18168811 is about 262.8908692463.

The spelling of 18168811 in words is "eighteen million, one hundred sixty-eight thousand, eight hundred eleven".