166057117 has 4 divisors (see below), whose sum is σ = 166082940. Its totient is φ = 166031296.

The previous prime is 166057097. The next prime is 166057121. The reversal of 166057117 is 711750661.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 711750661 = 223 ⋅3191707.

It can be written as a sum of positive squares in 2 ways, for example, as 100220121 + 65836996 = 10011^2 + 8114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166057117 is a prime.

It is a super-2 number, since 2×166057117² = 55149932212703378, 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 (166057127) 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, 5259 + ... + 18967.

It is an arithmetic number, because the mean of its divisors is an integer number (41520735).

Almost surely, 2^166057117 is an apocalyptic number.

It is an amenable number.

166057117 is a deficient number, since it is larger than the sum of its proper divisors (25823).

166057117 is a wasteful number, since it uses less digits than its factorization.

166057117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25822.

The product of its (nonzero) digits is 8820, while the sum is 34.

The square root of 166057117 is about 12886.3151055684. The cubic root of 166057117 is about 549.6494923761.

The spelling of 166057117 in words is "one hundred sixty-six million, fifty-seven thousand, one hundred seventeen".