166213277 has 2 divisors, whose sum is σ = 166213278. Its totient is φ = 166213276.

The previous prime is 166213253. The next prime is 166213319. The reversal of 166213277 is 772312661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163302841 + 2910436 = 12779^2 + 1706^2 .

It is a cyclic number.

It is not a de Polignac number, because 166213277 - 2¹² = 166209181 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166213237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83106638 + 83106639.

It is an arithmetic number, because the mean of its divisors is an integer number (83106639).

Almost surely, 2^166213277 is an apocalyptic number.

It is an amenable number.

166213277 is a deficient number, since it is larger than the sum of its proper divisors (1).

166213277 is an equidigital number, since it uses as much as digits as its factorization.

166213277 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 35.

The square root of 166213277 is about 12892.3728227196. The cubic root of 166213277 is about 549.8217350648.

The spelling of 166213277 in words is "one hundred sixty-six million, two hundred thirteen thousand, two hundred seventy-seven".