166131117 has 18 divisors (see below), whose sum is σ = 253266702. Its totient is φ = 104922864.

The previous prime is 166131109. The next prime is 166131143. The reversal of 166131117 is 711131661.

It can be written as a sum of positive squares in only one way, i.e., 160123716 + 6007401 = 12654^2 + 2451^2 .

It is not a de Polignac number, because 166131117 - 2³ = 166131109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166131167) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 22318 + ... + 28815.

Almost surely, 2^166131117 is an apocalyptic number.

It is an amenable number.

166131117 is a deficient number, since it is larger than the sum of its proper divisors (87135585).

166131117 is a wasteful number, since it uses less digits than its factorization.

166131117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51177 (or 51155 counting only the distinct ones).

The product of its digits is 756, while the sum is 27.

The square root of 166131117 is about 12889.1860487775. The cubic root of 166131117 is about 549.7311269824.

Adding to 166131117 its reverse (711131661), we get a palindrome (877262778).

The spelling of 166131117 in words is "one hundred sixty-six million, one hundred thirty-one thousand, one hundred seventeen".