166668277 has 2 divisors, whose sum is σ = 166668278. Its totient is φ = 166668276.

The previous prime is 166668269. The next prime is 166668331. The reversal of 166668277 is 772866661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92948881 + 73719396 = 9641^2 + 8586^2 .

It is a cyclic number.

It is not a de Polignac number, because 166668277 - 2³ = 166668269 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166668277.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166668877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83334138 + 83334139.

It is an arithmetic number, because the mean of its divisors is an integer number (83334139).

Almost surely, 2^166668277 is an apocalyptic number.

It is an amenable number.

166668277 is a deficient number, since it is larger than the sum of its proper divisors (1).

166668277 is an equidigital number, since it uses as much as digits as its factorization.

166668277 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 49.

The square root of 166668277 is about 12910.0068551492. The cubic root of 166668277 is about 550.3229805446.

The spelling of 166668277 in words is "one hundred sixty-six million, six hundred sixty-eight thousand, two hundred seventy-seven".