6440450287723 has 2 divisors, whose sum is σ = 6440450287724. Its totient is φ = 6440450287722.

The previous prime is 6440450287703. The next prime is 6440450287757. The reversal of 6440450287723 is 3277820540446.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6440450287723 is a prime.

It is not a weakly prime, because it can be changed into another prime (6440450287703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3220225143861 + 3220225143862.

It is an arithmetic number, because the mean of its divisors is an integer number (3220225143862).

Almost surely, 2^{6440450287723} is an apocalyptic number.

6440450287723 is a deficient number, since it is larger than the sum of its proper divisors (1).

6440450287723 is an equidigital number, since it uses as much as digits as its factorization.

6440450287723 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9031680, while the sum is 52.

The spelling of 6440450287723 in words is "six trillion, four hundred forty billion, four hundred fifty million, two hundred eighty-seven thousand, seven hundred twenty-three".