2565660431 has 4 divisors (see below), whose sum is σ = 2571505200. Its totient is φ = 2559815664.

The previous prime is 2565660397. The next prime is 2565660457. The reversal of 2565660431 is 1340665652.

It is a happy number.

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 2565660431 - 2²⁶ = 2498551567 is a prime.

It is a super-2 number, since 2×2565660431² = 13165226894398211522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565660491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2921726 + ... + 2922603.

It is an arithmetic number, because the mean of its divisors is an integer number (642876300).

Almost surely, 2^2565660431 is an apocalyptic number.

2565660431 is a deficient number, since it is larger than the sum of its proper divisors (5844769).

2565660431 is an equidigital number, since it uses as much as digits as its factorization.

2565660431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5844768.

The product of its (nonzero) digits is 129600, while the sum is 38.

The square root of 2565660431 is about 50652.3487214561. The cubic root of 2565660431 is about 1368.9882652263.

The spelling of 2565660431 in words is "two billion, five hundred sixty-five million, six hundred sixty thousand, four hundred thirty-one".