18211161159 has 6 divisors (see below), whose sum is σ = 26305010576. Its totient is φ = 12140774100.

The previous prime is 18211161139. The next prime is 18211161161. The reversal of 18211161159 is 95116111281.

18211161159 is a `hidden beast` number, since 1 + 8 + 21 + 11 + 611 + 5 + 9 = 666.

It is not a de Polignac number, because 18211161159 - 2⁵ = 18211161127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18211161139) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1011731167 + ... + 1011731184.

Almost surely, 2^18211161159 is an apocalyptic number.

18211161159 is a deficient number, since it is larger than the sum of its proper divisors (8093849417).

18211161159 is a wasteful number, since it uses less digits than its factorization.

18211161159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2023462357 (or 2023462354 counting only the distinct ones).

The product of its digits is 4320, while the sum is 36.

The spelling of 18211161159 in words is "eighteen billion, two hundred eleven million, one hundred sixty-one thousand, one hundred fifty-nine".