166864903 has 2 divisors, whose sum is σ = 166864904. Its totient is φ = 166864902.

The previous prime is 166864891. The next prime is 166864963. The reversal of 166864903 is 309468661.

It is a weak prime.

It is an emirp because it is prime and its reverse (309468661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166864903 - 2⁹ = 166864391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166864903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166864963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83432451 + 83432452.

It is an arithmetic number, because the mean of its divisors is an integer number (83432452).

Almost surely, 2^166864903 is an apocalyptic number.

166864903 is a deficient number, since it is larger than the sum of its proper divisors (1).

166864903 is an equidigital number, since it uses as much as digits as its factorization.

166864903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 166864903 is about 12917.6198659041. The cubic root of 166864903 is about 550.5393090178.

The spelling of 166864903 in words is "one hundred sixty-six million, eight hundred sixty-four thousand, nine hundred three".