2580256391 has 4 divisors (see below), whose sum is σ = 2581456992. Its totient is φ = 2579055792.

The previous prime is 2580256331. The next prime is 2580256429. The reversal of 2580256391 is 1936520852.

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

It is a cyclic number.

It is not a de Polignac number, because 2580256391 - 2¹⁸ = 2579994247 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 (2580256331) 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 in 3 ways as a sum of consecutive naturals, for example, 597071 + ... + 601376.

It is an arithmetic number, because the mean of its divisors is an integer number (645364248).

Almost surely, 2^2580256391 is an apocalyptic number.

2580256391 is a deficient number, since it is larger than the sum of its proper divisors (1200601).

2580256391 is a wasteful number, since it uses less digits than its factorization.

2580256391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1200600.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 2580256391 is about 50796.2241805432. The cubic root of 2580256391 is about 1371.5794012522.

The spelling of 2580256391 in words is "two billion, five hundred eighty million, two hundred fifty-six thousand, three hundred ninety-one".