6516803994 has 16 divisors (see below), whose sum is σ = 13034435232. Its totient is φ = 2172130128.

The previous prime is 6516803989. The next prime is 6516804029. The reversal of 6516803994 is 4993086156.

It is a Curzon number.

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, 123957 + ... + 168519.

It is an arithmetic number, because the mean of its divisors is an integer number (814652202).

Almost surely, 2^6516803994 is an apocalyptic number.

6516803994 is an abundant number, since it is smaller than the sum of its proper divisors (6517631238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6516803994 is a wasteful number, since it uses less digits than its factorization.

6516803994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68941.

The product of its (nonzero) digits is 1399680, while the sum is 51.

The square root of 6516803994 is about 80726.7241624482. The cubic root of 6516803994 is about 1867.8624277188.

The spelling of 6516803994 in words is "six billion, five hundred sixteen million, eight hundred three thousand, nine hundred ninety-four".