166791017 has 2 divisors, whose sum is σ = 166791018. Its totient is φ = 166791016.

The previous prime is 166791011. The next prime is 166791043. The reversal of 166791017 is 710197661.

166791017 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166435801 + 355216 = 12901^2 + 596^2 .

It is a cyclic number.

It is not a de Polignac number, because 166791017 - 2²⁶ = 99682153 is a prime.

It is a Chen prime.

It is a nialpdrome in base 15.

It is not a weakly prime, because it can be changed into another prime (166791011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83395508 + 83395509.

It is an arithmetic number, because the mean of its divisors is an integer number (83395509).

Almost surely, 2^166791017 is an apocalyptic number.

It is an amenable number.

166791017 is a deficient number, since it is larger than the sum of its proper divisors (1).

166791017 is an equidigital number, since it uses as much as digits as its factorization.

166791017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876, while the sum is 38.

The square root of 166791017 is about 12914.7596570745. The cubic root of 166791017 is about 550.4580393761.

The spelling of 166791017 in words is "one hundred sixty-six million, seven hundred ninety-one thousand, seventeen".