166421766 has 32 divisors (see below), whose sum is σ = 380809728. Its totient is φ = 47496960.

The previous prime is 166421737. The next prime is 166421771. The reversal of 166421766 is 667124661.

166421766 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53206 + ... + 56246.

It is an arithmetic number, because the mean of its divisors is an integer number (11900304).

Almost surely, 2^166421766 is an apocalyptic number.

166421766 is an abundant number, since it is smaller than the sum of its proper divisors (214387962).

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

166421766 is a wasteful number, since it uses less digits than its factorization.

166421766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4356.

The product of its digits is 72576, while the sum is 39.

The square root of 166421766 is about 12900.4560384507. The cubic root of 166421766 is about 550.0515279547.

The spelling of 166421766 in words is "one hundred sixty-six million, four hundred twenty-one thousand, seven hundred sixty-six".