7666538565 has 32 divisors (see below), whose sum is σ = 14397707520. Its totient is φ = 3409979904.

The previous prime is 7666538521. The next prime is 7666538611. The reversal of 7666538565 is 5658356667.

It is not a de Polignac number, because 7666538565 - 2¹¹ = 7666536517 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 982800 + ... + 990569.

It is an arithmetic number, because the mean of its divisors is an integer number (449928360).

Almost surely, 2^7666538565 is an apocalyptic number.

It is an amenable number.

7666538565 is a deficient number, since it is larger than the sum of its proper divisors (6731168955).

7666538565 is a wasteful number, since it uses less digits than its factorization.

7666538565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1973421.

The product of its digits is 27216000, while the sum is 57.

The square root of 7666538565 is about 87558.7720619699. The cubic root of 7666538565 is about 1971.8162508091.

The spelling of 7666538565 in words is "seven billion, six hundred sixty-six million, five hundred thirty-eight thousand, five hundred sixty-five".