18166955 has 4 divisors (see below), whose sum is σ = 21800352. Its totient is φ = 14533560.

The previous prime is 18166943. The next prime is 18166979. The reversal of 18166955 is 55966181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55966181 = 919 ⋅60899.

It is not a de Polignac number, because 18166955 - 2⁶ = 18166891 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1816691 + ... + 1816700.

It is an arithmetic number, because the mean of its divisors is an integer number (5450088).

Almost surely, 2^18166955 is an apocalyptic number.

18166955 is a deficient number, since it is larger than the sum of its proper divisors (3633397).

18166955 is an equidigital number, since it uses as much as digits as its factorization.

18166955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3633396.

The product of its digits is 64800, while the sum is 41.

The square root of 18166955 is about 4262.2711082239. The cubic root of 18166955 is about 262.8819172375.

The spelling of 18166955 in words is "eighteen million, one hundred sixty-six thousand, nine hundred fifty-five".