7665665668 has 12 divisors (see below), whose sum is σ = 13512834972. Its totient is φ = 3804855680.

The previous prime is 7665665627. The next prime is 7665665713. The reversal of 7665665668 is 8665665667.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6731874304 + 933791364 = 82048^2 + 30558^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6993673 + ... + 6994768.

It is an arithmetic number, because the mean of its divisors is an integer number (1126069581).

Almost surely, 2^7665665668 is an apocalyptic number.

It is an amenable number.

7665665668 is a deficient number, since it is larger than the sum of its proper divisors (5847169304).

7665665668 is a wasteful number, since it uses less digits than its factorization.

7665665668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13988582 (or 13988580 counting only the distinct ones).

The product of its digits is 65318400, while the sum is 61.

The square root of 7665665668 is about 87553.7872853025. The cubic root of 7665665668 is about 1971.7414122622.

Subtracting 7665665668 from its reverse (8665665667), we obtain a palindrome (999999999).

The spelling of 7665665668 in words is "seven billion, six hundred sixty-five million, six hundred sixty-five thousand, six hundred sixty-eight".