9727856665 has 16 divisors (see below), whose sum is σ = 12026818512. Its totient is φ = 7548021504.

The previous prime is 9727856629. The next prime is 9727856669. The reversal of 9727856665 is 5666587279.

It can be written as a sum of positive squares in 8 ways, for example, as 571536 + 9727285129 = 756^2 + 98627^2 .

It is a cyclic number.

It is not a de Polignac number, because 9727856665 - 2²¹ = 9725759513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9727856669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24294 + ... + 141583.

It is an arithmetic number, because the mean of its divisors is an integer number (751676157).

Almost surely, 2^9727856665 is an apocalyptic number.

It is an amenable number.

9727856665 is a deficient number, since it is larger than the sum of its proper divisors (2298961847).

9727856665 is a wasteful number, since it uses less digits than its factorization.

9727856665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166236.

The product of its digits is 38102400, while the sum is 61.

The square root of 9727856665 is about 98629.8974195958. The cubic root of 9727856665 is about 2134.7108344044.

The spelling of 9727856665 in words is "nine billion, seven hundred twenty-seven million, eight hundred fifty-six thousand, six hundred sixty-five".