6668345699 has 2 divisors, whose sum is σ = 6668345700. Its totient is φ = 6668345698.

The previous prime is 6668345689. The next prime is 6668345729. The reversal of 6668345699 is 9965438666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6668345699 - 2²⁸ = 6399910243 is a prime.

It is a super-2 number, since 2×6668345699² = 88933668722743597202, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6668345639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3334172849 + 3334172850.

It is an arithmetic number, because the mean of its divisors is an integer number (3334172850).

Almost surely, 2^6668345699 is an apocalyptic number.

6668345699 is a deficient number, since it is larger than the sum of its proper divisors (1).

6668345699 is an equidigital number, since it uses as much as digits as its factorization.

6668345699 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50388480, while the sum is 62.

The square root of 6668345699 is about 81659.9393766613. The cubic root of 6668345699 is about 1882.2300474912.

The spelling of 6668345699 in words is "six billion, six hundred sixty-eight million, three hundred forty-five thousand, six hundred ninety-nine".