166638499 has 2 divisors, whose sum is σ = 166638500. Its totient is φ = 166638498.

The previous prime is 166638469. The next prime is 166638529. The reversal of 166638499 is 994836661.

It is a balanced prime because it is at equal distance from previous prime (166638469) and next prime (166638529).

It is a cyclic number.

It is not a de Polignac number, because 166638499 - 2⁵ = 166638467 is a prime.

It is not a weakly prime, because it can be changed into another prime (166638469) 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, 83319249 + 83319250.

It is an arithmetic number, because the mean of its divisors is an integer number (83319250).

Almost surely, 2^166638499 is an apocalyptic number.

166638499 is a deficient number, since it is larger than the sum of its proper divisors (1).

166638499 is an equidigital number, since it uses as much as digits as its factorization.

166638499 is an odious number, because the sum of its binary digits is odd.

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

The square root of 166638499 is about 12908.8535122218. The cubic root of 166638499 is about 550.2902038737.

The spelling of 166638499 in words is "one hundred sixty-six million, six hundred thirty-eight thousand, four hundred ninety-nine".