6440713457 has 2 divisors, whose sum is σ = 6440713458. Its totient is φ = 6440713456.

The previous prime is 6440713453. The next prime is 6440713507. The reversal of 6440713457 is 7543170446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5229603856 + 1211109601 = 72316^2 + 34801^2 .

It is a cyclic number.

It is not a de Polignac number, because 6440713457 - 2² = 6440713453 is a prime.

It is not a weakly prime, because it can be changed into another prime (6440713453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3220356728 + 3220356729.

It is an arithmetic number, because the mean of its divisors is an integer number (3220356729).

Almost surely, 2^6440713457 is an apocalyptic number.

It is an amenable number.

6440713457 is a deficient number, since it is larger than the sum of its proper divisors (1).

6440713457 is an equidigital number, since it uses as much as digits as its factorization.

6440713457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 282240, while the sum is 41.

The square root of 6440713457 is about 80254.0557043692. The cubic root of 6440713457 is about 1860.5641963049.

The spelling of 6440713457 in words is "six billion, four hundred forty million, seven hundred thirteen thousand, four hundred fifty-seven".