166290889 has 6 divisors (see below), whose sum is σ = 176648414. Its totient is φ = 156508800.

The previous prime is 166290881. The next prime is 166290899. The reversal of 166290889 is 988092661.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 105575625 + 60715264 = 10275^2 + 7792^2 .

It is not a de Polignac number, because 166290889 - 2³ = 166290881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166290881) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 287412 + ... + 287989.

Almost surely, 2^166290889 is an apocalyptic number.

It is an amenable number.

166290889 is a deficient number, since it is larger than the sum of its proper divisors (10357525).

166290889 is an equidigital number, since it uses as much as digits as its factorization.

166290889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 575435 (or 575418 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 49.

The square root of 166290889 is about 12895.3824681550. The cubic root of 166290889 is about 549.9073000792.

The spelling of 166290889 in words is "one hundred sixty-six million, two hundred ninety thousand, eight hundred eighty-nine".