166765145 has 4 divisors (see below), whose sum is σ = 200118180. Its totient is φ = 133412112.

The previous prime is 166765139. The next prime is 166765217. The reversal of 166765145 is 541567661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 51782416 + 114982729 = 7196^2 + 10723^2 .

It is a cyclic number.

It is not a de Polignac number, because 166765145 - 2⁸ = 166764889 is a prime.

It is a super-2 number, since 2×166765145² = 55621227173742050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16676510 + ... + 16676519.

It is an arithmetic number, because the mean of its divisors is an integer number (50029545).

Almost surely, 2^166765145 is an apocalyptic number.

It is an amenable number.

166765145 is a deficient number, since it is larger than the sum of its proper divisors (33353035).

166765145 is an equidigital number, since it uses as much as digits as its factorization.

166765145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33353034.

The product of its digits is 151200, while the sum is 41.

The square root of 166765145 is about 12913.7579735722. The cubic root of 166765145 is about 550.4295762388.

The spelling of 166765145 in words is "one hundred sixty-six million, seven hundred sixty-five thousand, one hundred forty-five".