166970291 has 2 divisors, whose sum is σ = 166970292. Its totient is φ = 166970290.

The previous prime is 166970281. The next prime is 166970339. The reversal of 166970291 is 192079661.

It is a weak prime.

It is an emirp because it is prime and its reverse (192079661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166970291 - 2⁶ = 166970227 is a prime.

It is a super-3 number, since 3×166970291³ (a number of 26 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (166970201) 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, 83485145 + 83485146.

It is an arithmetic number, because the mean of its divisors is an integer number (83485146).

Almost surely, 2^166970291 is an apocalyptic number.

166970291 is a deficient number, since it is larger than the sum of its proper divisors (1).

166970291 is an equidigital number, since it uses as much as digits as its factorization.

166970291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 166970291 is about 12921.6984564724. The cubic root of 166970291 is about 550.6551872427.

The spelling of 166970291 in words is "one hundred sixty-six million, nine hundred seventy thousand, two hundred ninety-one".