166625089 has 2 divisors, whose sum is σ = 166625090. Its totient is φ = 166625088.

The previous prime is 166625083. The next prime is 166625113. The reversal of 166625089 is 980526661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139428864 + 27196225 = 11808^2 + 5215^2 .

It is a cyclic number.

It is not a de Polignac number, because 166625089 - 2¹³ = 166616897 is a prime.

It is not a weakly prime, because it can be changed into another prime (166625083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83312544 + 83312545.

It is an arithmetic number, because the mean of its divisors is an integer number (83312545).

Almost surely, 2^166625089 is an apocalyptic number.

It is an amenable number.

166625089 is a deficient number, since it is larger than the sum of its proper divisors (1).

166625089 is an equidigital number, since it uses as much as digits as its factorization.

166625089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 166625089 is about 12908.3340908113. The cubic root of 166625089 is about 550.2754421997.

The spelling of 166625089 in words is "one hundred sixty-six million, six hundred twenty-five thousand, eighty-nine".