166161665 has 16 divisors (see below), whose sum is σ = 203685840. Its totient is φ = 130099200.

The previous prime is 166161659. The next prime is 166161673. The reversal of 166161665 is 566161661.

It is a happy number.

166161665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 5607424 + 160554241 = 2368^2 + 12671^2 .

It is not a de Polignac number, because 166161665 - 2¹² = 166157569 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43097 + ... + 46793.

It is an arithmetic number, because the mean of its divisors is an integer number (12730365).

Almost surely, 2^166161665 is an apocalyptic number.

It is an amenable number.

166161665 is a deficient number, since it is larger than the sum of its proper divisors (37524175).

166161665 is a wasteful number, since it uses less digits than its factorization.

166161665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3892.

The product of its digits is 38880, while the sum is 38.

The square root of 166161665 is about 12890.3710187101. The cubic root of 166161665 is about 549.7648195612.

It can be divided in two parts, 16616 and 1665, that added together give a palindrome (18281).

The spelling of 166161665 in words is "one hundred sixty-six million, one hundred sixty-one thousand, six hundred sixty-five".