166661646 has 8 divisors (see below), whose sum is σ = 333323304. Its totient is φ = 55553880.

The previous prime is 166661609. The next prime is 166661681. The reversal of 166661646 is 646166661.

It is a sphenic number, since it is the product of 3 distinct primes.

166661646 is an admirable number.

It is a super-2 number, since 2×166661646² = 55552208494858632, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 166661598 and 166661607.

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, 13888465 + ... + 13888476.

It is an arithmetic number, because the mean of its divisors is an integer number (41665413).

Almost surely, 2^166661646 is an apocalyptic number.

166661646 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

166661646 is a wasteful number, since it uses less digits than its factorization.

166661646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27776946.

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

The square root of 166661646 is about 12909.7500363098. The cubic root of 166661646 is about 550.3156821349.

The spelling of 166661646 in words is "one hundred sixty-six million, six hundred sixty-one thousand, six hundred forty-six".