25613406655 has 4 divisors (see below), whose sum is σ = 30736087992. Its totient is φ = 20490725320.

The previous prime is 25613406649. The next prime is 25613406659. The reversal of 25613406655 is 55660431652.

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

It is not a de Polignac number, because 25613406655 - 2⁷ = 25613406527 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 (25613406659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2561340661 + ... + 2561340670.

It is an arithmetic number, because the mean of its divisors is an integer number (7684021998).

Almost surely, 2^25613406655 is an apocalyptic number.

25613406655 is a deficient number, since it is larger than the sum of its proper divisors (5122681337).

25613406655 is an equidigital number, since it uses as much as digits as its factorization.

25613406655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5122681336.

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

The spelling of 25613406655 in words is "twenty-five billion, six hundred thirteen million, four hundred six thousand, six hundred fifty-five".