6516803993 has 4 divisors (see below), whose sum is σ = 7447776000. Its totient is φ = 5585831988.

The previous prime is 6516803989. The next prime is 6516804029. The reversal of 6516803993 is 3993086156.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6516803993 - 2² = 6516803989 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6516803093) 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, 465485993 + ... + 465486006.

It is an arithmetic number, because the mean of its divisors is an integer number (1861944000).

Almost surely, 2^6516803993 is an apocalyptic number.

It is an amenable number.

6516803993 is a deficient number, since it is larger than the sum of its proper divisors (930972007).

6516803993 is an equidigital number, since it uses as much as digits as its factorization.

6516803993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930972006.

The product of its (nonzero) digits is 1049760, while the sum is 50.

The square root of 6516803993 is about 80726.7241562545. The cubic root of 6516803993 is about 1867.8624276232.

The spelling of 6516803993 in words is "six billion, five hundred sixteen million, eight hundred three thousand, nine hundred ninety-three".