18231002161 has 4 divisors (see below), whose sum is σ = 18618895872. Its totient is φ = 17843108452.

The previous prime is 18231002093. The next prime is 18231002173. The reversal of 18231002161 is 16120013281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16120013281 = 163 ⋅98895787.

It is a cyclic number.

It is not a de Polignac number, because 18231002161 - 2⁷ = 18231002033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18231008161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193946785 + ... + 193946878.

It is an arithmetic number, because the mean of its divisors is an integer number (4654723968).

Almost surely, 2^18231002161 is an apocalyptic number.

It is an amenable number.

18231002161 is a deficient number, since it is larger than the sum of its proper divisors (387893711).

18231002161 is an equidigital number, since it uses as much as digits as its factorization.

18231002161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387893710.

The product of its (nonzero) digits is 576, while the sum is 25.

The spelling of 18231002161 in words is "eighteen billion, two hundred thirty-one million, two thousand, one hundred sixty-one".