16678861 has 2 divisors, whose sum is σ = 16678862. Its totient is φ = 16678860.

The previous prime is 16678817. The next prime is 16678873. The reversal of 16678861 is 16887661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12602500 + 4076361 = 3550^2 + 2019^2 .

It is a cyclic number.

It is not a de Polignac number, because 16678861 - 2⁷ = 16678733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16678801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8339430 + 8339431.

It is an arithmetic number, because the mean of its divisors is an integer number (8339431).

Almost surely, 2^16678861 is an apocalyptic number.

It is an amenable number.

16678861 is a deficient number, since it is larger than the sum of its proper divisors (1).

16678861 is an equidigital number, since it uses as much as digits as its factorization.

16678861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 43.

The square root of 16678861 is about 4083.9761262769. The cubic root of 16678861 is about 255.4987598282.

The spelling of 16678861 in words is "sixteen million, six hundred seventy-eight thousand, eight hundred sixty-one".