166899644 has 12 divisors (see below), whose sum is σ = 294659904. Its totient is φ = 82711104.

The previous prime is 166899631. The next prime is 166899673. The reversal of 166899644 is 446998661.

It is a happy number.

166899644 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 184172 + ... + 185075.

It is an arithmetic number, because the mean of its divisors is an integer number (24554992).

Almost surely, 2^166899644 is an apocalyptic number.

It is an amenable number.

166899644 is a deficient number, since it is larger than the sum of its proper divisors (127760260).

166899644 is a wasteful number, since it uses less digits than its factorization.

166899644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369364 (or 369362 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 53.

The square root of 166899644 is about 12918.9645095882. The cubic root of 166899644 is about 550.5775134946.

The spelling of 166899644 in words is "one hundred sixty-six million, eight hundred ninety-nine thousand, six hundred forty-four".