2565786645 has 48 divisors (see below), whose sum is σ = 4688349120. Its totient is φ = 1331339328.

The previous prime is 2565786623. The next prime is 2565786647. The reversal of 2565786645 is 5466875652.

2565786645 is a `hidden beast` number, since 2 + 5 + 6 + 578 + 6 + 64 + 5 = 666.

2565786645 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2565786645 - 2⁹ = 2565786133 is a prime.

It is a super-2 number, since 2×2565786645² = 13166522215320712050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2565786591 and 2565786600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565786647) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 177874 + ... + 191756.

It is an arithmetic number, because the mean of its divisors is an integer number (97673940).

Almost surely, 2^2565786645 is an apocalyptic number.

It is an amenable number.

2565786645 is a deficient number, since it is larger than the sum of its proper divisors (2122562475).

2565786645 is a wasteful number, since it uses less digits than its factorization.

2565786645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13971 (or 13928 counting only the distinct ones).

The product of its digits is 12096000, while the sum is 54.

The square root of 2565786645 is about 50653.5945911048. The cubic root of 2565786645 is about 1369.0107133323.

The spelling of 2565786645 in words is "two billion, five hundred sixty-five million, seven hundred eighty-six thousand, six hundred forty-five".