6440716757 has 2 divisors, whose sum is σ = 6440716758. Its totient is φ = 6440716756.

The previous prime is 6440716753. The next prime is 6440716759. The reversal of 6440716757 is 7576170446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4465714276 + 1975002481 = 66826^2 + 44441^2 .

It is a cyclic number.

It is not a de Polignac number, because 6440716757 - 2² = 6440716753 is a prime.

Together with 6440716759, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6440716753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3220358378 + 3220358379.

It is an arithmetic number, because the mean of its divisors is an integer number (3220358379).

Almost surely, 2^6440716757 is an apocalyptic number.

It is an amenable number.

6440716757 is a deficient number, since it is larger than the sum of its proper divisors (1).

6440716757 is an equidigital number, since it uses as much as digits as its factorization.

6440716757 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 987840, while the sum is 47.

The square root of 6440716757 is about 80254.0762640752. The cubic root of 6440716757 is about 1860.5645140678.

The spelling of 6440716757 in words is "six billion, four hundred forty million, seven hundred sixteen thousand, seven hundred fifty-seven".