6440523344 has 20 divisors (see below), whose sum is σ = 12506952480. Its totient is φ = 3212922720.

The previous prime is 6440523343. The next prime is 6440523373. The reversal of 6440523344 is 4433250446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440523343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 451442 + ... + 465489.

It is an arithmetic number, because the mean of its divisors is an integer number (625347624).

Almost surely, 2^6440523344 is an apocalyptic number.

It is an amenable number.

6440523344 is a deficient number, since it is larger than the sum of its proper divisors (6066429136).

6440523344 is a wasteful number, since it uses less digits than its factorization.

6440523344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917378 (or 917372 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 35.

The square root of 6440523344 is about 80252.8712508157. The cubic root of 6440523344 is about 1860.5458897967.

The spelling of 6440523344 in words is "six billion, four hundred forty million, five hundred twenty-three thousand, three hundred forty-four".