166386901 has 2 divisors, whose sum is σ = 166386902. Its totient is φ = 166386900.

The previous prime is 166386893. The next prime is 166386907. The reversal of 166386901 is 109683661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144624676 + 21762225 = 12026^2 + 4665^2 .

It is a cyclic number.

It is not a de Polignac number, because 166386901 - 2³ = 166386893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166386907) 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 as a sum of consecutive naturals, namely, 83193450 + 83193451.

It is an arithmetic number, because the mean of its divisors is an integer number (83193451).

Almost surely, 2^166386901 is an apocalyptic number.

It is an amenable number.

166386901 is a deficient number, since it is larger than the sum of its proper divisors (1).

166386901 is an equidigital number, since it uses as much as digits as its factorization.

166386901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 166386901 is about 12899.1046588513. The cubic root of 166386901 is about 550.0131137369.

The spelling of 166386901 in words is "one hundred sixty-six million, three hundred eighty-six thousand, nine hundred one".