6440601697 has 2 divisors, whose sum is σ = 6440601698. Its totient is φ = 6440601696.

The previous prime is 6440601683. The next prime is 6440601773. The reversal of 6440601697 is 7961060446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4015630161 + 2424971536 = 63369^2 + 49244^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6440601697 is a prime.

It is not a weakly prime, because it can be changed into another prime (6440604697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3220300848 + 3220300849.

It is an arithmetic number, because the mean of its divisors is an integer number (3220300849).

Almost surely, 2^6440601697 is an apocalyptic number.

It is an amenable number.

6440601697 is a deficient number, since it is larger than the sum of its proper divisors (1).

6440601697 is an equidigital number, since it uses as much as digits as its factorization.

6440601697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 6440601697 is about 80253.3594125505. The cubic root of 6440601697 is about 1860.5534346680.

The spelling of 6440601697 in words is "six billion, four hundred forty million, six hundred one thousand, six hundred ninety-seven".