166664442 has 16 divisors (see below), whose sum is σ = 380947392. Its totient is φ = 47618400.

The previous prime is 166664441. The next prime is 166664501. The reversal of 166664442 is 244466661.

It is a self number, because there is not a number n which added to its sum of digits gives 166664442.

It is not an unprimeable number, because it can be changed into a prime (166664441) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1984059 + ... + 1984142.

It is an arithmetic number, because the mean of its divisors is an integer number (23809212).

Almost surely, 2^166664442 is an apocalyptic number.

166664442 is an abundant number, since it is smaller than the sum of its proper divisors (214282950).

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

166664442 is a wasteful number, since it uses less digits than its factorization.

166664442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3968213.

The product of its digits is 165888, while the sum is 39.

The square root of 166664442 is about 12909.8583261010. The cubic root of 166664442 is about 550.3187595757.

The spelling of 166664442 in words is "one hundred sixty-six million, six hundred sixty-four thousand, four hundred forty-two".