166163765 has 16 divisors (see below), whose sum is σ = 209779200. Its totient is φ = 126165312.

The previous prime is 166163761. The next prime is 166163779. The reversal of 166163765 is 567361661.

It is not a de Polignac number, because 166163765 - 2² = 166163761 is a prime.

It is a super-2 number, since 2×166163765² = 55220793597950450, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166163761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1157 + ... + 18266.

It is an arithmetic number, because the mean of its divisors is an integer number (13111200).

Almost surely, 2^166163765 is an apocalyptic number.

It is an amenable number.

166163765 is a deficient number, since it is larger than the sum of its proper divisors (43615435).

166163765 is a wasteful number, since it uses less digits than its factorization.

166163765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19516.

The product of its digits is 136080, while the sum is 41.

The square root of 166163765 is about 12890.4524746031. The cubic root of 166163765 is about 549.7671355813.

The spelling of 166163765 in words is "one hundred sixty-six million, one hundred sixty-three thousand, seven hundred sixty-five".