166613913 has 6 divisors (see below), whose sum is σ = 240664554. Its totient is φ = 111075936.

The previous prime is 166613911. The next prime is 166613947. The reversal of 166613913 is 319316661.

It can be written as a sum of positive squares in only one way, i.e., 156425049 + 10188864 = 12507^2 + 3192^2 .

It is not a de Polignac number, because 166613913 - 2¹ = 166613911 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166613911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9256320 + ... + 9256337.

It is an arithmetic number, because the mean of its divisors is an integer number (40110759).

Almost surely, 2^166613913 is an apocalyptic number.

It is an amenable number.

166613913 is a deficient number, since it is larger than the sum of its proper divisors (74050641).

166613913 is a wasteful number, since it uses less digits than its factorization.

166613913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18512663 (or 18512660 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 166613913 is about 12907.9011849332. The cubic root of 166613913 is about 550.2631390988.

The spelling of 166613913 in words is "one hundred sixty-six million, six hundred thirteen thousand, nine hundred thirteen".