5640321865 has 4 divisors (see below), whose sum is σ = 6768386244. Its totient is φ = 4512257488.

The previous prime is 5640321839. The next prime is 5640321913. The reversal of 5640321865 is 5681230465.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1644059209 + 3996262656 = 40547^2 + 63216^2 .

It is a cyclic number.

It is not a de Polignac number, because 5640321865 - 2⁵ = 5640321833 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 564032182 + ... + 564032191.

It is an arithmetic number, because the mean of its divisors is an integer number (1692096561).

Almost surely, 2^5640321865 is an apocalyptic number.

It is an amenable number.

5640321865 is a deficient number, since it is larger than the sum of its proper divisors (1128064379).

5640321865 is a wasteful number, since it uses less digits than its factorization.

5640321865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128064378.

The product of its (nonzero) digits is 172800, while the sum is 40.

The square root of 5640321865 is about 75102.0763028560. The cubic root of 5640321865 is about 1780.0599509539.

The spelling of 5640321865 in words is "five billion, six hundred forty million, three hundred twenty-one thousand, eight hundred sixty-five".