6666516513 has 10 divisors (see below), whose sum is σ = 9958623554. Its totient is φ = 4444344288.

The previous prime is 6666516497. The next prime is 6666516533. The reversal of 6666516513 is 3156156666.

It can be written as a sum of positive squares in only one way, i.e., 4415203809 + 2251312704 = 66447^2 + 47448^2 .

It is not a de Polignac number, because 6666516513 - 2⁴ = 6666516497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6666516533) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 41151256 + ... + 41151417.

Almost surely, 2^6666516513 is an apocalyptic number.

It is an amenable number.

6666516513 is a deficient number, since it is larger than the sum of its proper divisors (3292107041).

6666516513 is an equidigital number, since it uses as much as digits as its factorization.

6666516513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82302685 (or 82302676 counting only the distinct ones).

The product of its digits is 583200, while the sum is 45.

The square root of 6666516513 is about 81648.7385879292. The cubic root of 6666516513 is about 1882.0579276550.

The spelling of 6666516513 in words is "six billion, six hundred sixty-six million, five hundred sixteen thousand, five hundred thirteen".