166659166 has 4 divisors (see below), whose sum is σ = 249988752. Its totient is φ = 83329582.

The previous prime is 166659161. The next prime is 166659169. The reversal of 166659166 is 661956661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 661956661 = 14051 ⋅47111.

It is a super-2 number, since 2×166659166² = 55550555223631112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166659161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41664790 + ... + 41664793.

It is an arithmetic number, because the mean of its divisors is an integer number (62497188).

Almost surely, 2^166659166 is an apocalyptic number.

166659166 is a deficient number, since it is larger than the sum of its proper divisors (83329586).

166659166 is an equidigital number, since it uses as much as digits as its factorization.

166659166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83329585.

The product of its digits is 349920, while the sum is 46.

The square root of 166659166 is about 12909.6539845187. The cubic root of 166659166 is about 550.3129524734.

The spelling of 166659166 in words is "one hundred sixty-six million, six hundred fifty-nine thousand, one hundred sixty-six".