16680919 has 2 divisors, whose sum is σ = 16680920. Its totient is φ = 16680918.

The previous prime is 16680913. The next prime is 16680943. The reversal of 16680919 is 91908661.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16680919 is a prime.

It is a super-2 number, since 2×16680919² = 556506117369122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16680913) 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, 8340459 + 8340460.

It is an arithmetic number, because the mean of its divisors is an integer number (8340460).

Almost surely, 2^16680919 is an apocalyptic number.

16680919 is a deficient number, since it is larger than the sum of its proper divisors (1).

16680919 is an equidigital number, since it uses as much as digits as its factorization.

16680919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 16680919 is about 4084.2280788418. The cubic root of 16680919 is about 255.5092680362.

The spelling of 16680919 in words is "sixteen million, six hundred eighty thousand, nine hundred nineteen".