166646166 has 16 divisors (see below), whose sum is σ = 333576624. Its totient is φ = 55501344.

The previous prime is 166646141. The next prime is 166646171. The reversal of 166646166 is 661646661.

166646166 = 2134² + 2135² + ... + 2169².

It is a congruent number.

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, 3805 + ... + 18648.

It is an arithmetic number, because the mean of its divisors is an integer number (20848539).

Almost surely, 2^166646166 is an apocalyptic number.

166646166 is an abundant number, since it is smaller than the sum of its proper divisors (166930458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166646166 is a wasteful number, since it uses less digits than its factorization.

166646166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23695.

The product of its digits is 186624, while the sum is 42.

The square root of 166646166 is about 12909.1504755348. The cubic root of 166646166 is about 550.2986433206.

The spelling of 166646166 in words is "one hundred sixty-six million, six hundred forty-six thousand, one hundred sixty-six".