16661369 has 2 divisors, whose sum is σ = 16661370. Its totient is φ = 16661368.

The previous prime is 16661363. The next prime is 16661401. The reversal of 16661369 is 96316661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12709225 + 3952144 = 3565^2 + 1988^2 .

It is a cyclic number.

It is not a de Polignac number, because 16661369 - 2¹² = 16657273 is a prime.

It is a super-2 number, since 2×16661369² = 555202433908322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16661363) 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, 8330684 + 8330685.

It is an arithmetic number, because the mean of its divisors is an integer number (8330685).

Almost surely, 2^16661369 is an apocalyptic number.

It is an amenable number.

16661369 is a deficient number, since it is larger than the sum of its proper divisors (1).

16661369 is an equidigital number, since it uses as much as digits as its factorization.

16661369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 38.

The square root of 16661369 is about 4081.8340240632. The cubic root of 16661369 is about 255.4094102502.

The spelling of 16661369 in words is "sixteen million, six hundred sixty-one thousand, three hundred sixty-nine".