16681667 has 2 divisors, whose sum is σ = 16681668. Its totient is φ = 16681666.

The previous prime is 16681661. The next prime is 16681673. The reversal of 16681667 is 76618661.

It is a balanced prime because it is at equal distance from previous prime (16681661) and next prime (16681673).

It is a cyclic number.

It is not a de Polignac number, because 16681667 - 2²⁰ = 15633091 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16681661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8340833 + 8340834.

It is an arithmetic number, because the mean of its divisors is an integer number (8340834).

Almost surely, 2^16681667 is an apocalyptic number.

16681667 is a deficient number, since it is larger than the sum of its proper divisors (1).

16681667 is an equidigital number, since it uses as much as digits as its factorization.

16681667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 41.

The square root of 16681667 is about 4084.3196495867. The cubic root of 16681667 is about 255.5130871319.

The spelling of 16681667 in words is "sixteen million, six hundred eighty-one thousand, six hundred sixty-seven".