16665851 has 2 divisors, whose sum is σ = 16665852. Its totient is φ = 16665850.

The previous prime is 16665841. The next prime is 16665863. The reversal of 16665851 is 15856661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16665851 - 2¹⁰ = 16664827 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16665841) 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, 8332925 + 8332926.

It is an arithmetic number, because the mean of its divisors is an integer number (8332926).

Almost surely, 2^16665851 is an apocalyptic number.

16665851 is a deficient number, since it is larger than the sum of its proper divisors (1).

16665851 is an equidigital number, since it uses as much as digits as its factorization.

16665851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43200, while the sum is 38.

The square root of 16665851 is about 4082.3830050597. The cubic root of 16665851 is about 255.4323103761.

The spelling of 16665851 in words is "sixteen million, six hundred sixty-five thousand, eight hundred fifty-one".