166544666 has 4 divisors (see below), whose sum is σ = 249817002. Its totient is φ = 83272332.

The previous prime is 166544663. The next prime is 166544683. The reversal of 166544666 is 666445661.

166544666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 155127025 + 11417641 = 12455^2 + 3379^2 .

It is not an unprimeable number, because it can be changed into a prime (166544663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41636165 + ... + 41636168.

Almost surely, 2^166544666 is an apocalyptic number.

166544666 is a deficient number, since it is larger than the sum of its proper divisors (83272336).

166544666 is an equidigital number, since it uses as much as digits as its factorization.

166544666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83272335.

The product of its digits is 622080, while the sum is 44.

The square root of 166544666 is about 12905.2185568475. The cubic root of 166544666 is about 550.1868962629.

The spelling of 166544666 in words is "one hundred sixty-six million, five hundred forty-four thousand, six hundred sixty-six".