6866639999 has 2 divisors, whose sum is σ = 6866640000. Its totient is φ = 6866639998.

The previous prime is 6866639977. The next prime is 6866640007. The reversal of 6866639999 is 9999366686.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6866639999 - 2³² = 2571672703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6866639909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3433319999 + 3433320000.

It is an arithmetic number, because the mean of its divisors is an integer number (3433320000).

Almost surely, 2^6866639999 is an apocalyptic number.

6866639999 is a deficient number, since it is larger than the sum of its proper divisors (1).

6866639999 is an equidigital number, since it uses as much as digits as its factorization.

6866639999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204073344, while the sum is 71.

The square root of 6866639999 is about 82865.1917212529. The cubic root of 6866639999 is about 1900.7051859752.

The spelling of 6866639999 in words is "six billion, eight hundred sixty-six million, six hundred thirty-nine thousand, nine hundred ninety-nine".