16661419 has 2 divisors, whose sum is σ = 16661420. Its totient is φ = 16661418.

The previous prime is 16661417. The next prime is 16661429. The reversal of 16661419 is 91416661.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16661419 - 2¹ = 16661417 is a prime.

It is a super-2 number, since 2×16661419² = 555205766187122, which contains 22 as substring.

Together with 16661417, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16661417) 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, 8330709 + 8330710.

It is an arithmetic number, because the mean of its divisors is an integer number (8330710).

Almost surely, 2^16661419 is an apocalyptic number.

16661419 is a deficient number, since it is larger than the sum of its proper divisors (1).

16661419 is an equidigital number, since it uses as much as digits as its factorization.

16661419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 34.

The square root of 16661419 is about 4081.8401487564. The cubic root of 16661419 is about 255.4096657406.

The spelling of 16661419 in words is "sixteen million, six hundred sixty-one thousand, four hundred nineteen".