2565203591 has 2 divisors, whose sum is σ = 2565203592. Its totient is φ = 2565203590.

The previous prime is 2565203533. The next prime is 2565203629. The reversal of 2565203591 is 1953025652.

It is an a-pointer prime, because the next prime (2565203629) can be obtained adding 2565203591 to its sum of digits (38).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2565203591 - 2⁶ = 2565203527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2565203521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1282601795 + 1282601796.

It is an arithmetic number, because the mean of its divisors is an integer number (1282601796).

Almost surely, 2^2565203591 is an apocalyptic number.

2565203591 is a deficient number, since it is larger than the sum of its proper divisors (1).

2565203591 is an equidigital number, since it uses as much as digits as its factorization.

2565203591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81000, while the sum is 38.

The square root of 2565203591 is about 50647.8389568597. The cubic root of 2565203591 is about 1368.9070066525.

The spelling of 2565203591 in words is "two billion, five hundred sixty-five million, two hundred three thousand, five hundred ninety-one".