166878117 has 16 divisors (see below), whose sum is σ = 282545280. Its totient is φ = 95358816.

The previous prime is 166878113. The next prime is 166878119. The reversal of 166878117 is 711878661.

It is a happy number.

It is not a de Polignac number, because 166878117 - 2² = 166878113 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166878113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 441288 + ... + 441665.

It is an arithmetic number, because the mean of its divisors is an integer number (17659080).

Almost surely, 2^166878117 is an apocalyptic number.

It is an amenable number.

166878117 is a deficient number, since it is larger than the sum of its proper divisors (115667163).

166878117 is an equidigital number, since it uses as much as digits as its factorization.

166878117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 882969 (or 882963 counting only the distinct ones).

The product of its digits is 112896, while the sum is 45.

The square root of 166878117 is about 12918.1313277115. The cubic root of 166878117 is about 550.5538410020.

The spelling of 166878117 in words is "one hundred sixty-six million, eight hundred seventy-eight thousand, one hundred seventeen".