18166669 has 2 divisors, whose sum is σ = 18166670. Its totient is φ = 18166668.

The previous prime is 18166663. The next prime is 18166697. The reversal of 18166669 is 96666181.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18164644 + 2025 = 4262^2 + 45^2 .

It is a cyclic number.

It is not a de Polignac number, because 18166669 - 2³ = 18166661 is a prime.

It is a super-2 number, since 2×18166669² = 660055725111122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18166661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9083334 + 9083335.

It is an arithmetic number, because the mean of its divisors is an integer number (9083335).

Almost surely, 2^18166669 is an apocalyptic number.

It is an amenable number.

18166669 is a deficient number, since it is larger than the sum of its proper divisors (1).

18166669 is an equidigital number, since it uses as much as digits as its factorization.

18166669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 43.

The square root of 18166669 is about 4262.2375579031. The cubic root of 18166669 is about 262.8805377250.

The spelling of 18166669 in words is "eighteen million, one hundred sixty-six thousand, six hundred sixty-nine".