2565264156641 has 4 divisors (see below), whose sum is σ = 2634595620372. Its totient is φ = 2495932692912.

The previous prime is 2565264156629. The next prime is 2565264156683. The reversal of 2565264156641 is 1466514625652.

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 1948927681600 + 616336475041 = 1396040^2 + 785071^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2565264156641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2565264156241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34665731810 + ... + 34665731883.

It is an arithmetic number, because the mean of its divisors is an integer number (658648905093).

Almost surely, 2^{2565264156641} is an apocalyptic number.

It is an amenable number.

2565264156641 is a deficient number, since it is larger than the sum of its proper divisors (69331463731).

2565264156641 is an equidigital number, since it uses as much as digits as its factorization.

2565264156641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69331463730.

The product of its digits is 10368000, while the sum is 53.

The spelling of 2565264156641 in words is "two trillion, five hundred sixty-five billion, two hundred sixty-four million, one hundred fifty-six thousand, six hundred forty-one".