166116881 has 8 divisors (see below), whose sum is σ = 190397760. Its totient is φ = 141973488.

The previous prime is 166116859. The next prime is 166116883. The reversal of 166116881 is 188611661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166116881 - 2²² = 161922577 is a prime.

It is a super-2 number, since 2×166116881² = 55189636306336322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166116883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31766 + ... + 36623.

It is an arithmetic number, because the mean of its divisors is an integer number (23799720).

Almost surely, 2^166116881 is an apocalyptic number.

It is an amenable number.

166116881 is a deficient number, since it is larger than the sum of its proper divisors (24280879).

166116881 is an equidigital number, since it uses as much as digits as its factorization.

166116881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68743.

The product of its digits is 13824, while the sum is 38.

The square root of 166116881 is about 12888.6337910579. The cubic root of 166116881 is about 549.7154241327.

The spelling of 166116881 in words is "one hundred sixty-six million, one hundred sixteen thousand, eight hundred eighty-one".