5640991865 has 8 divisors (see below), whose sum is σ = 6770874240. Its totient is φ = 4511670832.

The previous prime is 5640991823. The next prime is 5640991883. The reversal of 5640991865 is 5681990465.

It is a happy number.

5640991865 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 5640991865 - 2²⁶ = 5573883001 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117899 + ... + 158688.

It is an arithmetic number, because the mean of its divisors is an integer number (846359280).

Almost surely, 2^5640991865 is an apocalyptic number.

It is an amenable number.

5640991865 is a deficient number, since it is larger than the sum of its proper divisors (1129882375).

5640991865 is a wasteful number, since it uses less digits than its factorization.

5640991865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280671.

The product of its (nonzero) digits is 2332800, while the sum is 53.

The square root of 5640991865 is about 75106.5367661164. The cubic root of 5640991865 is about 1780.1304311484.

The spelling of 5640991865 in words is "five billion, six hundred forty million, nine hundred ninety-one thousand, eight hundred sixty-five".