166003291 has 2 divisors, whose sum is σ = 166003292. Its totient is φ = 166003290.

The previous prime is 166003273. The next prime is 166003303. The reversal of 166003291 is 192300661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166003291 - 2¹⁷ = 165872219 is a prime.

It is not a weakly prime, because it can be changed into another prime (166003991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83001645 + 83001646.

It is an arithmetic number, because the mean of its divisors is an integer number (83001646).

Almost surely, 2^166003291 is an apocalyptic number.

166003291 is a deficient number, since it is larger than the sum of its proper divisors (1).

166003291 is an equidigital number, since it uses as much as digits as its factorization.

166003291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 166003291 is about 12884.2264416611. The cubic root of 166003291 is about 549.5900978912.

It can be divided in two parts, 16600 and 3291, that added together give a palindrome (19891).

The spelling of 166003291 in words is "one hundred sixty-six million, three thousand, two hundred ninety-one".