166303661 has 16 divisors (see below), whose sum is σ = 177207360. Its totient is φ = 155796480.

The previous prime is 166303633. The next prime is 166303679.

166303661 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 166303661 - 2⁶ = 166303597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166303681) 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 15 ways as a sum of consecutive naturals, for example, 240326 + ... + 241016.

It is an arithmetic number, because the mean of its divisors is an integer number (11075460).

Almost surely, 2^166303661 is an apocalyptic number.

It is an amenable number.

166303661 is a deficient number, since it is larger than the sum of its proper divisors (10903699).

166303661 is a wasteful number, since it uses less digits than its factorization.

166303661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 956.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 166303661 is about 12895.8776746680. The cubic root of 166303661 is about 549.9213782934.

The spelling of 166303661 in words is "one hundred sixty-six million, three hundred three thousand, six hundred sixty-one".