5640646811 has 4 divisors (see below), whose sum is σ = 5640799800. Its totient is φ = 5640493824.

The previous prime is 5640646787. The next prime is 5640646813. The reversal of 5640646811 is 1186460465.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5640646811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5640646813) 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, 16475 + ... + 107483.

It is an arithmetic number, because the mean of its divisors is an integer number (1410199950).

Almost surely, 2^5640646811 is an apocalyptic number.

5640646811 is a deficient number, since it is larger than the sum of its proper divisors (152989).

5640646811 is an equidigital number, since it uses as much as digits as its factorization.

5640646811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152988.

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 5640646811 is about 75104.2396339914. The cubic root of 5640646811 is about 1780.0941341245.

The spelling of 5640646811 in words is "five billion, six hundred forty million, six hundred forty-six thousand, eight hundred eleven".