16648889 has 2 divisors, whose sum is σ = 16648890. Its totient is φ = 16648888.

The previous prime is 16648873. The next prime is 16648901. The reversal of 16648889 is 98884661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16605625 + 43264 = 4075^2 + 208^2 .

It is a cyclic number.

It is not a de Polignac number, because 16648889 - 2⁴ = 16648873 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (16648859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8324444 + 8324445.

It is an arithmetic number, because the mean of its divisors is an integer number (8324445).

Almost surely, 2^16648889 is an apocalyptic number.

It is an amenable number.

16648889 is a deficient number, since it is larger than the sum of its proper divisors (1).

16648889 is an equidigital number, since it uses as much as digits as its factorization.

16648889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 663552, while the sum is 50.

The square root of 16648889 is about 4080.3050131087. The cubic root of 16648889 is about 255.3456238625.

The spelling of 16648889 in words is "sixteen million, six hundred forty-eight thousand, eight hundred eighty-nine".