6440303253 has 8 divisors (see below), whose sum is σ = 8598885568. Its totient is φ = 4287628224.

The previous prime is 6440303249. The next prime is 6440303299. The reversal of 6440303253 is 3523030446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6440303253 - 2² = 6440303249 is a prime.

It is the 80252-nd Hogben number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6440303253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440303053) by changing a digit.

It is a nontrivial repunit in base 80251.

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 in 7 ways as a sum of consecutive naturals, for example, 1474276 + ... + 1478637.

It is an arithmetic number, because the mean of its divisors is an integer number (1074860696).

Almost surely, 2^6440303253 is an apocalyptic number.

It is an amenable number.

6440303253 is a deficient number, since it is larger than the sum of its proper divisors (2158582315).

6440303253 is a wasteful number, since it uses less digits than its factorization.

6440303253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2953643.

The product of its (nonzero) digits is 25920, while the sum is 30.

The square root of 6440303253 is about 80251.5000046728. The cubic root of 6440303253 is about 1860.5246961737.

Adding to 6440303253 its reverse (3523030446), we get a palindrome (9963333699).

The spelling of 6440303253 in words is "six billion, four hundred forty million, three hundred three thousand, two hundred fifty-three".