16671647 has 2 divisors, whose sum is σ = 16671648. Its totient is φ = 16671646.

The previous prime is 16671643. The next prime is 16671653. The reversal of 16671647 is 74617661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16671647 - 2² = 16671643 is a prime.

It is a Chen prime.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 16671647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16671643) 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, 8335823 + 8335824.

It is an arithmetic number, because the mean of its divisors is an integer number (8335824).

Almost surely, 2^16671647 is an apocalyptic number.

16671647 is a deficient number, since it is larger than the sum of its proper divisors (1).

16671647 is an equidigital number, since it uses as much as digits as its factorization.

16671647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 38.

The square root of 16671647 is about 4083.0928228489. The cubic root of 16671647 is about 255.4619181067.

The spelling of 16671647 in words is "sixteen million, six hundred seventy-one thousand, six hundred forty-seven".