166424661 has 12 divisors (see below), whose sum is σ = 258882988. Its totient is φ = 102415104.

The previous prime is 166424641. The next prime is 166424681.

166424661 is a `hidden beast` number, since 1 + 6 + 642 + 4 + 6 + 6 + 1 = 666.

166424661 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (166424641) and next prime (166424681).

It can be written as a sum of positive squares in 2 ways, for example, as 49914225 + 116510436 = 7065^2 + 10794^2 .

It is not a de Polignac number, because 166424661 - 2⁹ = 166424149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166424641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 711100 + ... + 711333.

Almost surely, 2^166424661 is an apocalyptic number.

It is an amenable number.

166424661 is a deficient number, since it is larger than the sum of its proper divisors (92458327).

166424661 is a wasteful number, since it uses less digits than its factorization.

166424661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1422452 (or 1422449 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 166424661 is about 12900.5682432984. The cubic root of 166424661 is about 550.0547174212.

The spelling of 166424661 in words is "one hundred sixty-six million, four hundred twenty-four thousand, six hundred sixty-one".