6680699891 has 2 divisors, whose sum is σ = 6680699892. Its totient is φ = 6680699890.

The previous prime is 6680699887. The next prime is 6680699923. The reversal of 6680699891 is 1989960866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6680699891 - 2² = 6680699887 is a prime.

It is not a weakly prime, because it can be changed into another prime (6680699591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3340349945 + 3340349946.

It is an arithmetic number, because the mean of its divisors is an integer number (3340349946).

Almost surely, 2^6680699891 is an apocalyptic number.

6680699891 is a deficient number, since it is larger than the sum of its proper divisors (1).

6680699891 is an equidigital number, since it uses as much as digits as its factorization.

6680699891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10077696, while the sum is 62.

The square root of 6680699891 is about 81735.5485147069. The cubic root of 6680699891 is about 1883.3917092164.

The spelling of 6680699891 in words is "six billion, six hundred eighty million, six hundred ninety-nine thousand, eight hundred ninety-one".