166664441 has 2 divisors, whose sum is σ = 166664442. Its totient is φ = 166664440.

The previous prime is 166664437. The next prime is 166664501. The reversal of 166664441 is 144466661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113316025 + 53348416 = 10645^2 + 7304^2 .

It is a cyclic number.

It is not a de Polignac number, because 166664441 - 2² = 166664437 is a prime.

It is equal to p_9326891 and since 166664441 and 9326891 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 166664395 and 166664404.

It is not a weakly prime, because it can be changed into another prime (166664341) 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, 83332220 + 83332221.

It is an arithmetic number, because the mean of its divisors is an integer number (83332221).

Almost surely, 2^166664441 is an apocalyptic number.

It is an amenable number.

166664441 is a deficient number, since it is larger than the sum of its proper divisors (1).

166664441 is an equidigital number, since it uses as much as digits as its factorization.

166664441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 38.

The square root of 166664441 is about 12909.8582873709. The cubic root of 166664441 is about 550.3187584751.

The spelling of 166664441 in words is "one hundred sixty-six million, six hundred sixty-four thousand, four hundred forty-one".