6516566643 has 4 divisors (see below), whose sum is σ = 8688755528. Its totient is φ = 4344377760.

The previous prime is 6516566627. The next prime is 6516566647. The reversal of 6516566643 is 3466656156.

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

It is not a de Polignac number, because 6516566643 - 2⁴ = 6516566627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6516566592 and 6516566601.

It is not an unprimeable number, because it can be changed into a prime (6516566647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1086094438 + ... + 1086094443.

It is an arithmetic number, because the mean of its divisors is an integer number (2172188882).

Almost surely, 2^6516566643 is an apocalyptic number.

6516566643 is a deficient number, since it is larger than the sum of its proper divisors (2172188885).

6516566643 is a wasteful number, since it uses less digits than its factorization.

6516566643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2172188884.

The product of its digits is 2332800, while the sum is 48.

The square root of 6516566643 is about 80725.2540596807. The cubic root of 6516566643 is about 1867.8397507339.

The spelling of 6516566643 in words is "six billion, five hundred sixteen million, five hundred sixty-six thousand, six hundred forty-three".