166065689 has 2 divisors, whose sum is σ = 166065690. Its totient is φ = 166065688.

The previous prime is 166065677. The next prime is 166065721. The reversal of 166065689 is 986560661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156250000 + 9815689 = 12500^2 + 3133^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166065689 is a prime.

It is a super-3 number, since 3×166065689³ (a number of 26 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166065619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83032844 + 83032845.

It is an arithmetic number, because the mean of its divisors is an integer number (83032845).

Almost surely, 2^166065689 is an apocalyptic number.

It is an amenable number.

166065689 is a deficient number, since it is larger than the sum of its proper divisors (1).

166065689 is an equidigital number, since it uses as much as digits as its factorization.

166065689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 47.

The square root of 166065689 is about 12886.6477021761. The cubic root of 166065689 is about 549.6589499942.

The spelling of 166065689 in words is "one hundred sixty-six million, sixty-five thousand, six hundred eighty-nine".