6440330503 has 2 divisors, whose sum is σ = 6440330504. Its totient is φ = 6440330502.

The previous prime is 6440330443. The next prime is 6440330531. The reversal of 6440330503 is 3050330446.

It is an a-pointer prime, because the next prime (6440330531) can be obtained adding 6440330503 to its sum of digits (28).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6440330503 - 2¹³ = 6440322311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6440330803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3220165251 + 3220165252.

It is an arithmetic number, because the mean of its divisors is an integer number (3220165252).

Almost surely, 2^6440330503 is an apocalyptic number.

6440330503 is a deficient number, since it is larger than the sum of its proper divisors (1).

6440330503 is an equidigital number, since it uses as much as digits as its factorization.

6440330503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 28.

The square root of 6440330503 is about 80251.6697832512. The cubic root of 6440330503 is about 1860.5273202337.

Adding to 6440330503 its reverse (3050330446), we get a palindrome (9490660949).

The spelling of 6440330503 in words is "six billion, four hundred forty million, three hundred thirty thousand, five hundred three".