166330661 has 4 divisors (see below), whose sum is σ = 190092192. Its totient is φ = 142569132.

The previous prime is 166330643. The next prime is 166330663. The reversal of 166330661 is 166033661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 166330661 - 2²² = 162136357 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 (166330663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11880755 + ... + 11880768.

It is an arithmetic number, because the mean of its divisors is an integer number (47523048).

Almost surely, 2^166330661 is an apocalyptic number.

It is an amenable number.

166330661 is a deficient number, since it is larger than the sum of its proper divisors (23761531).

166330661 is an equidigital number, since it uses as much as digits as its factorization.

166330661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23761530.

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

The square root of 166330661 is about 12896.9244783398. The cubic root of 166330661 is about 549.9511372569.

The spelling of 166330661 in words is "one hundred sixty-six million, three hundred thirty thousand, six hundred sixty-one".