6516610665 has 16 divisors (see below), whose sum is σ = 10508679168. Its totient is φ = 3448158336.

The previous prime is 6516610609. The next prime is 6516610699. The reversal of 6516610665 is 5660166156.

It is not a de Polignac number, because 6516610665 - 2¹⁰ = 6516609641 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1708492 + ... + 1712301.

It is an arithmetic number, because the mean of its divisors is an integer number (656792448).

Almost surely, 2^6516610665 is an apocalyptic number.

It is an amenable number.

6516610665 is a deficient number, since it is larger than the sum of its proper divisors (3992068503).

6516610665 is a wasteful number, since it uses less digits than its factorization.

6516610665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3420928.

The product of its (nonzero) digits is 194400, while the sum is 42.

The square root of 6516610665 is about 80725.5267248223. The cubic root of 6516610665 is about 1867.8439567246.

The spelling of 6516610665 in words is "six billion, five hundred sixteen million, six hundred ten thousand, six hundred sixty-five".