166668449 has 2 divisors, whose sum is σ = 166668450. Its totient is φ = 166668448.

The previous prime is 166668401. The next prime is 166668457. The reversal of 166668449 is 944866661.

166668449 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128414224 + 38254225 = 11332^2 + 6185^2 .

It is a cyclic number.

It is not a de Polignac number, because 166668449 - 2²⁰ = 165619873 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 166668397 and 166668406.

It is not a weakly prime, because it can be changed into another prime (166668479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83334224 + 83334225.

It is an arithmetic number, because the mean of its divisors is an integer number (83334225).

Almost surely, 2^166668449 is an apocalyptic number.

It is an amenable number.

166668449 is a deficient number, since it is larger than the sum of its proper divisors (1).

166668449 is an equidigital number, since it uses as much as digits as its factorization.

166668449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1492992, while the sum is 50.

The square root of 166668449 is about 12910.0135166467. The cubic root of 166668449 is about 550.3231698538.

The spelling of 166668449 in words is "one hundred sixty-six million, six hundred sixty-eight thousand, four hundred forty-nine".