16681836667 has 2 divisors, whose sum is σ = 16681836668. Its totient is φ = 16681836666.

The previous prime is 16681836559. The next prime is 16681836673. The reversal of 16681836667 is 76663818661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16681836667 - 2¹⁵ = 16681803899 is a prime.

It is not a weakly prime, because it can be changed into another prime (16681830667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8340918333 + 8340918334.

It is an arithmetic number, because the mean of its divisors is an integer number (8340918334).

Almost surely, 2^16681836667 is an apocalyptic number.

16681836667 is a deficient number, since it is larger than the sum of its proper divisors (1).

16681836667 is an equidigital number, since it uses as much as digits as its factorization.

16681836667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10450944, while the sum is 58.

The spelling of 16681836667 in words is "sixteen billion, six hundred eighty-one million, eight hundred thirty-six thousand, six hundred sixty-seven".