2565870389 has 16 divisors (see below), whose sum is σ = 2689589760. Its totient is φ = 2445845760.

The previous prime is 2565870347. The next prime is 2565870427. The reversal of 2565870389 is 9830785652.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2565870389 is a prime.

It is a super-2 number, since 2×2565870389² = 13167381706294022642, which contains 22 as substring.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2565870389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565870689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 290957 + ... + 299645.

It is an arithmetic number, because the mean of its divisors is an integer number (168099360).

Almost surely, 2^2565870389 is an apocalyptic number.

It is an amenable number.

2565870389 is a deficient number, since it is larger than the sum of its proper divisors (123719371).

2565870389 is a wasteful number, since it uses less digits than its factorization.

2565870389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8900.

The product of its (nonzero) digits is 3628800, while the sum is 53.

The square root of 2565870389 is about 50654.4212186853. The cubic root of 2565870389 is about 1369.0256074241.

The spelling of 2565870389 in words is "two billion, five hundred sixty-five million, eight hundred seventy thousand, three hundred eighty-nine".