166725866 has 16 divisors (see below), whose sum is σ = 254067840. Its totient is φ = 82043520.

The previous prime is 166725859. The next prime is 166725869. The reversal of 166725866 is 668527661.

It is a self number, because there is not a number n which added to its sum of digits gives 166725866.

It is not an unprimeable number, because it can be changed into a prime (166725869) 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, 53306 + ... + 56346.

It is an arithmetic number, because the mean of its divisors is an integer number (15879240).

Almost surely, 2^166725866 is an apocalyptic number.

166725866 is a deficient number, since it is larger than the sum of its proper divisors (87341974).

166725866 is a wasteful number, since it uses less digits than its factorization.

166725866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3469.

The product of its digits is 725760, while the sum is 47.

The square root of 166725866 is about 12912.2370641187. The cubic root of 166725866 is about 550.3863577334.

The spelling of 166725866 in words is "one hundred sixty-six million, seven hundred twenty-five thousand, eight hundred sixty-six".