166888899 has 12 divisors (see below), whose sum is σ = 241935616. Its totient is φ = 110855952.

The previous prime is 166888889. The next prime is 166888921. The reversal of 166888899 is 998888661.

166888899 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 166888899 - 2⁹ = 166888387 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (166888829) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30979 + ... + 35964.

Almost surely, 2^166888899 is an apocalyptic number.

166888899 is a deficient number, since it is larger than the sum of its proper divisors (75046717).

166888899 is a wasteful number, since it uses less digits than its factorization.

166888899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67226 (or 67223 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 63.

The square root of 166888899 is about 12918.5486413916. The cubic root of 166888899 is about 550.5656978466.

The spelling of 166888899 in words is "one hundred sixty-six million, eight hundred eighty-eight thousand, eight hundred ninety-nine".