166646117 has 4 divisors (see below), whose sum is σ = 181795776. Its totient is φ = 151496460.

The previous prime is 166646101. The next prime is 166646119. The reversal of 166646117 is 711646661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 711646661 = 11 ⋅64695151.

It is a cyclic number.

It is not a de Polignac number, because 166646117 - 2⁴ = 166646101 is a prime.

It is a super-2 number, since 2×166646117² = 55541856622355378, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166646119) 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, 7574813 + ... + 7574834.

It is an arithmetic number, because the mean of its divisors is an integer number (45448944).

Almost surely, 2^166646117 is an apocalyptic number.

It is an amenable number.

166646117 is a deficient number, since it is larger than the sum of its proper divisors (15149659).

166646117 is a wasteful number, since it uses less digits than its factorization.

166646117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15149658.

The product of its digits is 36288, while the sum is 38.

The square root of 166646117 is about 12909.1485776561. The cubic root of 166646117 is about 550.2985893847.

The spelling of 166646117 in words is "one hundred sixty-six million, six hundred forty-six thousand, one hundred seventeen".