2565734651 has 4 divisors (see below), whose sum is σ = 2569893672. Its totient is φ = 2561575632.

The previous prime is 2565734629. The next prime is 2565734657. The reversal of 2565734651 is 1564375652.

It is a happy number.

2565734651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2565734651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2565734657) 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, 2078585 + ... + 2079818.

It is an arithmetic number, because the mean of its divisors is an integer number (642473418).

Almost surely, 2^2565734651 is an apocalyptic number.

2565734651 is a deficient number, since it is larger than the sum of its proper divisors (4159021).

2565734651 is an equidigital number, since it uses as much as digits as its factorization.

2565734651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4159020.

The product of its digits is 756000, while the sum is 44.

The square root of 2565734651 is about 50653.0813574061. The cubic root of 2565734651 is about 1369.0014658988.

The spelling of 2565734651 in words is "two billion, five hundred sixty-five million, seven hundred thirty-four thousand, six hundred fifty-one".