166343661 has 36 divisors (see below), whose sum is σ = 266846944. Its totient is φ = 99768240.

The previous prime is 166343641. The next prime is 166343677.

166343661 is a `hidden beast` number, since 16 + 634 + 3 + 6 + 6 + 1 = 666.

166343661 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 166343661 - 2⁵ = 166343629 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 (166343621) 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 35 ways as a sum of consecutive naturals, for example, 111426 + ... + 112908.

Almost surely, 2^166343661 is an apocalyptic number.

166343661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166343661 is a deficient number, since it is larger than the sum of its proper divisors (100503283).

166343661 is a wasteful number, since it uses less digits than its factorization.

166343661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1614 (or 1600 counting only the distinct ones).

The product of its digits is 46656, while the sum is 36.

The square root of 166343661 is about 12897.4284646204. The cubic root of 166343661 is about 549.9654644982.

The spelling of 166343661 in words is "one hundred sixty-six million, three hundred forty-three thousand, six hundred sixty-one".