2051565565 has 24 divisors (see below), whose sum is σ = 3014552160. Its totient is φ = 1332743328.

The previous prime is 2051565563. The next prime is 2051565583. The reversal of 2051565565 is 5655651502.

2051565565 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2051565565 - 2¹ = 2051565563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2051565563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 215707 + ... + 225016.

It is an arithmetic number, because the mean of its divisors is an integer number (125606340).

Almost surely, 2^2051565565 is an apocalyptic number.

It is an amenable number.

2051565565 is a deficient number, since it is larger than the sum of its proper divisors (962986595).

2051565565 is a wasteful number, since it uses less digits than its factorization.

2051565565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440761 (or 440754 counting only the distinct ones).

The product of its (nonzero) digits is 225000, while the sum is 40.

The square root of 2051565565 is about 45294.2111643420. The cubic root of 2051565565 is about 1270.6573910709.

The spelling of 2051565565 in words is "two billion, fifty-one million, five hundred sixty-five thousand, five hundred sixty-five".