6440213659 has 8 divisors (see below), whose sum is σ = 7026895728. Its totient is φ = 5853732960.

The previous prime is 6440213641. The next prime is 6440213669. The reversal of 6440213659 is 9563120446.

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 6440213659 - 2⁹ = 6440213147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6440213669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20929 + ... + 115405.

It is an arithmetic number, because the mean of its divisors is an integer number (878361966).

Almost surely, 2^6440213659 is an apocalyptic number.

6440213659 is a deficient number, since it is larger than the sum of its proper divisors (586682069).

6440213659 is a wasteful number, since it uses less digits than its factorization.

6440213659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100685.

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 6440213659 is about 80250.9417950967. The cubic root of 6440213659 is about 1860.5160685974.

The spelling of 6440213659 in words is "six billion, four hundred forty million, two hundred thirteen thousand, six hundred fifty-nine".