6686872091 has 2 divisors, whose sum is σ = 6686872092. Its totient is φ = 6686872090.

The previous prime is 6686872057. The next prime is 6686872097. The reversal of 6686872091 is 1902786866.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6686872091 is a prime.

It is a super-2 number, since 2×6686872091² = 89428516722789424562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6686872097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3343436045 + 3343436046.

It is an arithmetic number, because the mean of its divisors is an integer number (3343436046).

Almost surely, 2^6686872091 is an apocalyptic number.

6686872091 is a deficient number, since it is larger than the sum of its proper divisors (1).

6686872091 is an equidigital number, since it uses as much as digits as its factorization.

6686872091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1741824, while the sum is 53.

The square root of 6686872091 is about 81773.2969312110. The cubic root of 6686872091 is about 1883.9715432847.

The spelling of 6686872091 in words is "six billion, six hundred eighty-six million, eight hundred seventy-two thousand, ninety-one".