2565990389 has 8 divisors (see below), whose sum is σ = 2647503360. Its totient is φ = 2485703376.

The previous prime is 2565990379. The next prime is 2565990397. The reversal of 2565990389 is 9830995652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2565990389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565990359) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 302237 + ... + 310610.

It is an arithmetic number, because the mean of its divisors is an integer number (330937920).

Almost surely, 2^2565990389 is an apocalyptic number.

It is an amenable number.

2565990389 is a deficient number, since it is larger than the sum of its proper divisors (81512971).

2565990389 is an equidigital number, since it uses as much as digits as its factorization.

2565990389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612979.

The product of its (nonzero) digits is 5248800, while the sum is 56.

The square root of 2565990389 is about 50655.6057016398. The cubic root of 2565990389 is about 1369.0469491766.

The spelling of 2565990389 in words is "two billion, five hundred sixty-five million, nine hundred ninety thousand, three hundred eighty-nine".