2725257165665 has 4 divisors (see below), whose sum is σ = 3270308598804. Its totient is φ = 2180205732528.

The previous prime is 2725257165661. The next prime is 2725257165737. The reversal of 2725257165665 is 5665617525272.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1696474990144 + 1028782175521 = 1302488^2 + 1014289^2 .

It is a cyclic number.

It is not a de Polignac number, because 2725257165665 - 2² = 2725257165661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2725257165661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 272525716562 + ... + 272525716571.

It is an arithmetic number, because the mean of its divisors is an integer number (817577149701).

Almost surely, 2^{2725257165665} is an apocalyptic number.

It is an amenable number.

2725257165665 is a deficient number, since it is larger than the sum of its proper divisors (545051433139).

2725257165665 is an equidigital number, since it uses as much as digits as its factorization.

2725257165665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545051433138.

The product of its digits is 52920000, while the sum is 59.

The spelling of 2725257165665 in words is "two trillion, seven hundred twenty-five billion, two hundred fifty-seven million, one hundred sixty-five thousand, six hundred sixty-five".