25655484581 has 4 divisors (see below), whose sum is σ = 25656187200. Its totient is φ = 25654781964.

The previous prime is 25655484557. The next prime is 25655484641. The reversal of 25655484581 is 18548455652.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25655484581 - 2²⁶ = 25588375717 is a prime.

It is a super-2 number, since 2×25655484581² (a number of 22 digits) 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 (25655484511) 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, 293351 + ... + 370628.

It is an arithmetic number, because the mean of its divisors is an integer number (6414046800).

Almost surely, 2^25655484581 is an apocalyptic number.

It is an amenable number.

25655484581 is a deficient number, since it is larger than the sum of its proper divisors (702619).

25655484581 is an equidigital number, since it uses as much as digits as its factorization.

25655484581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702618.

The product of its digits is 7680000, while the sum is 53.

The spelling of 25655484581 in words is "twenty-five billion, six hundred fifty-five million, four hundred eighty-four thousand, five hundred eighty-one".