25655604613 has 4 divisors (see below), whose sum is σ = 25662270528. Its totient is φ = 25648938700.

The previous prime is 25655604607. The next prime is 25655604643. The reversal of 25655604613 is 31640655652.

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 25655604613 - 2²¹ = 25653507461 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25655604613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25655604643) 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, 3327181 + ... + 3334882.

It is an arithmetic number, because the mean of its divisors is an integer number (6415567632).

Almost surely, 2^25655604613 is an apocalyptic number.

It is an amenable number.

25655604613 is a deficient number, since it is larger than the sum of its proper divisors (6665915).

25655604613 is an equidigital number, since it uses as much as digits as its factorization.

25655604613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6665914.

The product of its (nonzero) digits is 648000, while the sum is 43.

The spelling of 25655604613 in words is "twenty-five billion, six hundred fifty-five million, six hundred four thousand, six hundred thirteen".