16673681 has 2 divisors, whose sum is σ = 16673682. Its totient is φ = 16673680.

The previous prime is 16673669. The next prime is 16673729. The reversal of 16673681 is 18637661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15673681 + 1000000 = 3959^2 + 1000^2 .

It is a cyclic number.

It is not a de Polignac number, because 16673681 - 2¹⁰ = 16672657 is a prime.

It is a super-2 number, since 2×16673681² = 556023276179522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16673081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8336840 + 8336841.

It is an arithmetic number, because the mean of its divisors is an integer number (8336841).

Almost surely, 2^16673681 is an apocalyptic number.

It is an amenable number.

16673681 is a deficient number, since it is larger than the sum of its proper divisors (1).

16673681 is an equidigital number, since it uses as much as digits as its factorization.

16673681 is an odious number, because the sum of its binary digits is odd.

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

The square root of 16673681 is about 4083.3418911475. The cubic root of 16673681 is about 255.4723067706.

The spelling of 16673681 in words is "sixteen million, six hundred seventy-three thousand, six hundred eighty-one".