166613893 has 4 divisors (see below), whose sum is σ = 168331660. Its totient is φ = 164896128.

The previous prime is 166613891. The next prime is 166613899. The reversal of 166613893 is 398316661.

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 99341089 + 67272804 = 9967^2 + 8202^2 .

It is a cyclic number.

It is not a de Polignac number, because 166613893 - 2¹ = 166613891 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166613891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 858738 + ... + 858931.

It is an arithmetic number, because the mean of its divisors is an integer number (42082915).

Almost surely, 2^166613893 is an apocalyptic number.

It is an amenable number.

166613893 is a deficient number, since it is larger than the sum of its proper divisors (1717767).

166613893 is an equidigital number, since it uses as much as digits as its factorization.

166613893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1717766.

The product of its digits is 139968, while the sum is 43.

The square root of 166613893 is about 12907.9004102139. The cubic root of 166613893 is about 550.2631170813.

The spelling of 166613893 in words is "one hundred sixty-six million, six hundred thirteen thousand, eight hundred ninety-three".