65727665 has 4 divisors (see below), whose sum is σ = 78873204. Its totient is φ = 52582128.

The previous prime is 65727653. The next prime is 65727677. The reversal of 65727665 is 56672756.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (65727653) and next prime (65727677).

It can be written as a sum of positive squares in 2 ways, for example, as 18722929 + 47004736 = 4327^2 + 6856^2 .

It is a cyclic number.

It is not a de Polignac number, because 65727665 - 2¹² = 65723569 is a prime.

It is a Duffinian number.

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, 6572762 + ... + 6572771.

It is an arithmetic number, because the mean of its divisors is an integer number (19718301).

Almost surely, 2^65727665 is an apocalyptic number.

It is an amenable number.

65727665 is a deficient number, since it is larger than the sum of its proper divisors (13145539).

65727665 is a wasteful number, since it uses less digits than its factorization.

65727665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13145538.

The product of its digits is 529200, while the sum is 44.

The square root of 65727665 is about 8107.2600180332. The cubic root of 65727665 is about 403.5673917903.

The spelling of 65727665 in words is "sixty-five million, seven hundred twenty-seven thousand, six hundred sixty-five".