6440036513 has 8 divisors (see below), whose sum is σ = 6657745248. Its totient is φ = 6225416064.

The previous prime is 6440036507. The next prime is 6440036521. The reversal of 6440036513 is 3156300446.

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

It is a cyclic number.

It is not a de Polignac number, because 6440036513 - 2²⁸ = 6171601057 is a prime.

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 6440036513.

It is not an unprimeable number, because it can be changed into a prime (6440036563) 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 in 7 ways as a sum of consecutive naturals, for example, 767831 + ... + 776172.

It is an arithmetic number, because the mean of its divisors is an integer number (832218156).

Almost surely, 2^6440036513 is an apocalyptic number.

It is an amenable number.

6440036513 is a deficient number, since it is larger than the sum of its proper divisors (217708735).

6440036513 is a wasteful number, since it uses less digits than its factorization.

6440036513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544143.

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 6440036513 is about 80249.8380870641. The cubic root of 6440036513 is about 1860.4990098465.

Adding to 6440036513 its reverse (3156300446), we get a palindrome (9596336959).

The spelling of 6440036513 in words is "six billion, four hundred forty million, thirty-six thousand, five hundred thirteen".