18266665 has 16 divisors (see below), whose sum is σ = 22809600. Its totient is φ = 14026432.

The previous prime is 18266603. The next prime is 18266671. The reversal of 18266665 is 56666281.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18266665 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37896 + ... + 38374.

It is an arithmetic number, because the mean of its divisors is an integer number (1425600).

Almost surely, 2^18266665 is an apocalyptic number.

It is an amenable number.

18266665 is a deficient number, since it is larger than the sum of its proper divisors (4542935).

18266665 is a wasteful number, since it uses less digits than its factorization.

18266665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776.

The product of its digits is 103680, while the sum is 40.

The square root of 18266665 is about 4273.9519183070. The cubic root of 18266665 is about 263.3619857018.

The spelling of 18266665 in words is "eighteen million, two hundred sixty-six thousand, six hundred sixty-five".