2565391137 has 16 divisors (see below), whose sum is σ = 3705958080. Its totient is φ = 1572221952.

The previous prime is 2565391133. The next prime is 2565391139. The reversal of 2565391137 is 7311935652.

It is not a de Polignac number, because 2565391137 - 2² = 2565391133 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2565391133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 582712 + ... + 587097.

It is an arithmetic number, because the mean of its divisors is an integer number (231622380).

Almost surely, 2^2565391137 is an apocalyptic number.

It is an amenable number.

2565391137 is a deficient number, since it is larger than the sum of its proper divisors (1140566943).

2565391137 is a wasteful number, since it uses less digits than its factorization.

2565391137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1169872.

The product of its digits is 170100, while the sum is 42.

The square root of 2565391137 is about 50649.6903939205. The cubic root of 2565391137 is about 1368.9403668086.

The spelling of 2565391137 in words is "two billion, five hundred sixty-five million, three hundred ninety-one thousand, one hundred thirty-seven".