6684407551 has 2 divisors, whose sum is σ = 6684407552. Its totient is φ = 6684407550.

The previous prime is 6684407507. The next prime is 6684407579. The reversal of 6684407551 is 1557044866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6684407551 - 2²⁷ = 6550189823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6684407501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3342203775 + 3342203776.

It is an arithmetic number, because the mean of its divisors is an integer number (3342203776).

Almost surely, 2^6684407551 is an apocalyptic number.

6684407551 is a deficient number, since it is larger than the sum of its proper divisors (1).

6684407551 is an equidigital number, since it uses as much as digits as its factorization.

6684407551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 806400, while the sum is 46.

The square root of 6684407551 is about 81758.2261977350. The cubic root of 6684407551 is about 1883.7400601782.

The spelling of 6684407551 in words is "six billion, six hundred eighty-four million, four hundred seven thousand, five hundred fifty-one".