166690018 has 16 divisors (see below), whose sum is σ = 273067200. Its totient is φ = 75684400.

The previous prime is 166690009. The next prime is 166690019. The reversal of 166690018 is 810096661.

It is not an unprimeable number, because it can be changed into a prime (166690019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19008 + ... + 26356.

It is an arithmetic number, because the mean of its divisors is an integer number (17066700).

Almost surely, 2^166690018 is an apocalyptic number.

166690018 is a deficient number, since it is larger than the sum of its proper divisors (106377182).

166690018 is a wasteful number, since it uses less digits than its factorization.

166690018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8393.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 166690018 is about 12910.8488489332. The cubic root of 166690018 is about 550.3469084168.

The spelling of 166690018 in words is "one hundred sixty-six million, six hundred ninety thousand, eighteen".