166166885 has 4 divisors (see below), whose sum is σ = 199400268. Its totient is φ = 132933504.

The previous prime is 166166873. The next prime is 166166887. The reversal of 166166885 is 588661661.

166166885 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 588661661 = 7 ⋅84094523.

It can be written as a sum of positive squares in 2 ways, for example, as 32741284 + 133425601 = 5722^2 + 11551^2 .

It is a cyclic number.

It is not a de Polignac number, because 166166885 - 2¹⁶ = 166101349 is a prime.

It is a super-2 number, since 2×166166885² = 55222867341206450, 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 (166166887) 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, 16616684 + ... + 16616693.

It is an arithmetic number, because the mean of its divisors is an integer number (49850067).

Almost surely, 2^166166885 is an apocalyptic number.

It is an amenable number.

166166885 is a deficient number, since it is larger than the sum of its proper divisors (33233383).

166166885 is an equidigital number, since it uses as much as digits as its factorization.

166166885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33233382.

The product of its digits is 414720, while the sum is 47.

The square root of 166166885 is about 12890.5734938365. The cubic root of 166166885 is about 549.7705764893.

The spelling of 166166885 in words is "one hundred sixty-six million, one hundred sixty-six thousand, eight hundred eighty-five".