16664149 has 2 divisors, whose sum is σ = 16664150. Its totient is φ = 16664148.

The previous prime is 16664129. The next prime is 16664161. The reversal of 16664149 is 94146661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13359025 + 3305124 = 3655^2 + 1818^2 .

It is a cyclic number.

It is not a de Polignac number, because 16664149 - 2¹⁹ = 16139861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16664119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8332074 + 8332075.

It is an arithmetic number, because the mean of its divisors is an integer number (8332075).

Almost surely, 2^16664149 is an apocalyptic number.

It is an amenable number.

16664149 is a deficient number, since it is larger than the sum of its proper divisors (1).

16664149 is an equidigital number, since it uses as much as digits as its factorization.

16664149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 37.

The square root of 16664149 is about 4082.1745430591. The cubic root of 16664149 is about 255.4236147387.

The spelling of 16664149 in words is "sixteen million, six hundred sixty-four thousand, one hundred forty-nine".