166033661 has 2 divisors, whose sum is σ = 166033662. Its totient is φ = 166033660.

The previous prime is 166033607. The next prime is 166033663. The reversal of 166033661 is 166330661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165611161 + 422500 = 12869^2 + 650^2 .

It is a cyclic number.

It is not a de Polignac number, because 166033661 - 2¹⁴ = 166017277 is a prime.

Together with 166033663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166033663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83016830 + 83016831.

It is an arithmetic number, because the mean of its divisors is an integer number (83016831).

Almost surely, 2^166033661 is an apocalyptic number.

It is an amenable number.

166033661 is a deficient number, since it is larger than the sum of its proper divisors (1).

166033661 is an equidigital number, since it uses as much as digits as its factorization.

166033661 is an evil number, because the sum of its binary digits is even.

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

The square root of 166033661 is about 12885.4049606522. The cubic root of 166033661 is about 549.6236113503.

The spelling of 166033661 in words is "one hundred sixty-six million, thirty-three thousand, six hundred sixty-one".