16681673 has 2 divisors, whose sum is σ = 16681674. Its totient is φ = 16681672.

The previous prime is 16681667. The next prime is 16681681. The reversal of 16681673 is 37618661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16581184 + 100489 = 4072^2 + 317^2 .

It is an emirp because it is prime and its reverse (37618661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16681673 - 2¹⁰ = 16680649 is a prime.

It is not a weakly prime, because it can be changed into another prime (16681633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8340836 + 8340837.

It is an arithmetic number, because the mean of its divisors is an integer number (8340837).

Almost surely, 2^16681673 is an apocalyptic number.

It is an amenable number.

16681673 is a deficient number, since it is larger than the sum of its proper divisors (1).

16681673 is an equidigital number, since it uses as much as digits as its factorization.

16681673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 38.

The square root of 16681673 is about 4084.3203841031. The cubic root of 16681673 is about 255.5131177658.

The spelling of 16681673 in words is "sixteen million, six hundred eighty-one thousand, six hundred seventy-three".