6666680087 has 2 divisors, whose sum is σ = 6666680088. Its totient is φ = 6666680086.

The previous prime is 6666680021. The next prime is 6666680099. The reversal of 6666680087 is 7800866666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6666680087 - 2¹⁸ = 6666417943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6666680287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333340043 + 3333340044.

It is an arithmetic number, because the mean of its divisors is an integer number (3333340044).

Almost surely, 2^6666680087 is an apocalyptic number.

6666680087 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666680087 is an equidigital number, since it uses as much as digits as its factorization.

6666680087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3483648, while the sum is 53.

The square root of 6666680087 is about 81649.7402751534. The cubic root of 6666680087 is about 1882.0733206629.

The spelling of 6666680087 in words is "six billion, six hundred sixty-six million, six hundred eighty thousand, eighty-seven".