166406646 has 48 divisors (see below), whose sum is σ = 396183744. Its totient is φ = 46435536.

The previous prime is 166406629. The next prime is 166406687. The reversal of 166406646 is 646604661.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6061 + ... + 19223.

It is an arithmetic number, because the mean of its divisors is an integer number (8253828).

Almost surely, 2^166406646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166406646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (198091872).

166406646 is an abundant number, since it is smaller than the sum of its proper divisors (229777098).

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

166406646 is a wasteful number, since it uses less digits than its factorization.

166406646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13225 (or 13218 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 39.

The square root of 166406646 is about 12899.8699993450. The cubic root of 166406646 is about 550.0348694146.

The spelling of 166406646 in words is "one hundred sixty-six million, four hundred six thousand, six hundred forty-six".