166161569 has 16 divisors (see below), whose sum is σ = 193190400. Its totient is φ = 139973184.

The previous prime is 166161563. The next prime is 166161577. The reversal of 166161569 is 965161661.

It is a cyclic number.

It is not a de Polignac number, because 166161569 - 2⁸ = 166161313 is a prime.

It is a super-2 number, since 2×166161569² = 55219334025083522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166161563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148199 + ... + 149315.

It is an arithmetic number, because the mean of its divisors is an integer number (12074400).

Almost surely, 2^166161569 is an apocalyptic number.

It is an amenable number.

166161569 is a deficient number, since it is larger than the sum of its proper divisors (27028831).

166161569 is a wasteful number, since it uses less digits than its factorization.

166161569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1472.

The product of its digits is 58320, while the sum is 41.

The square root of 166161569 is about 12890.3672949998. The cubic root of 166161569 is about 549.7647136855.

The spelling of 166161569 in words is "one hundred sixty-six million, one hundred sixty-one thousand, five hundred sixty-nine".