2565939887 has 4 divisors (see below), whose sum is σ = 2932502736. Its totient is φ = 2199377040.

The previous prime is 2565939881. The next prime is 2565939907. The reversal of 2565939887 is 7889395652.

2565939887 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2565939887 - 2²⁰ = 2564891311 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 (2565939881) 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, 183281414 + ... + 183281427.

It is an arithmetic number, because the mean of its divisors is an integer number (733125684).

Almost surely, 2^2565939887 is an apocalyptic number.

2565939887 is a deficient number, since it is larger than the sum of its proper divisors (366562849).

2565939887 is an equidigital number, since it uses as much as digits as its factorization.

2565939887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366562848.

The product of its digits is 32659200, while the sum is 62.

The square root of 2565939887 is about 50655.1072153638. The cubic root of 2565939887 is about 1369.0379675811.

The spelling of 2565939887 in words is "two billion, five hundred sixty-five million, nine hundred thirty-nine thousand, eight hundred eighty-seven".