18166953 has 16 divisors (see below), whose sum is σ = 27780480. Its totient is φ = 10344576.

The previous prime is 18166943. The next prime is 18166979. The reversal of 18166953 is 35966181.

It is not a de Polignac number, because 18166953 - 2⁴ = 18166937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18166913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5293 + ... + 8021.

It is an arithmetic number, because the mean of its divisors is an integer number (1736280).

Almost surely, 2^18166953 is an apocalyptic number.

It is an amenable number.

18166953 is a deficient number, since it is larger than the sum of its proper divisors (9613527).

18166953 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (18166952) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (3056).

18166953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3056.

The product of its digits is 38880, while the sum is 39.

The square root of 18166953 is about 4262.2708736072. The cubic root of 18166953 is about 262.8819075906.

The spelling of 18166953 in words is "eighteen million, one hundred sixty-six thousand, nine hundred fifty-three".