2791568641 has 4 divisors (see below), whose sum is σ = 2798745300. Its totient is φ = 2784391984.

The previous prime is 2791568639. The next prime is 2791568651. The reversal of 2791568641 is 1468651972.

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 999824400 + 1791744241 = 31620^2 + 42329^2 .

It is a cyclic number.

It is not a de Polignac number, because 2791568641 - 2¹ = 2791568639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2791568651) 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, 3587746 + ... + 3588523.

It is an arithmetic number, because the mean of its divisors is an integer number (699686325).

Almost surely, 2^2791568641 is an apocalyptic number.

It is an amenable number.

2791568641 is a deficient number, since it is larger than the sum of its proper divisors (7176659).

2791568641 is an equidigital number, since it uses as much as digits as its factorization.

2791568641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7176658.

The product of its digits is 725760, while the sum is 49.

The square root of 2791568641 is about 52835.2973020877. The cubic root of 2791568641 is about 1408.0436024680.

The spelling of 2791568641 in words is "two billion, seven hundred ninety-one million, five hundred sixty-eight thousand, six hundred forty-one".