166489963 has 2 divisors, whose sum is σ = 166489964. Its totient is φ = 166489962.

The previous prime is 166489943. The next prime is 166490003. The reversal of 166489963 is 369984661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166489963 - 2⁵ = 166489931 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166489963.

It is not a weakly prime, because it can be changed into another prime (166489903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83244981 + 83244982.

It is an arithmetic number, because the mean of its divisors is an integer number (83244982).

Almost surely, 2^166489963 is an apocalyptic number.

166489963 is a deficient number, since it is larger than the sum of its proper divisors (1).

166489963 is an equidigital number, since it uses as much as digits as its factorization.

166489963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1679616, while the sum is 52.

The square root of 166489963 is about 12903.0989688524. The cubic root of 166489963 is about 550.1266518246.

The spelling of 166489963 in words is "one hundred sixty-six million, four hundred eighty-nine thousand, nine hundred sixty-three".