166978916 has 24 divisors (see below), whose sum is σ = 331255680. Its totient is φ = 73010592.

The previous prime is 166978907. The next prime is 166978939. The reversal of 166978916 is 619879661.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83516 + ... + 85491.

It is an arithmetic number, because the mean of its divisors is an integer number (13802320).

Almost surely, 2^166978916 is an apocalyptic number.

It is an amenable number.

166978916 is a deficient number, since it is larger than the sum of its proper divisors (164276764).

166978916 is a wasteful number, since it uses less digits than its factorization.

166978916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169043 (or 169041 counting only the distinct ones).

The product of its digits is 979776, while the sum is 53.

The square root of 166978916 is about 12922.0321931189. The cubic root of 166978916 is about 550.6646686084.

The spelling of 166978916 in words is "one hundred sixty-six million, nine hundred seventy-eight thousand, nine hundred sixteen".