25661252504 has 16 divisors (see below), whose sum is σ = 49773981600. Its totient is φ = 12388190752.

The previous prime is 25661252501. The next prime is 25661252543. The reversal of 25661252504 is 40525216652.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25661252501) 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, 55304192 + ... + 55304655.

It is an arithmetic number, because the mean of its divisors is an integer number (3110873850).

Almost surely, 2^25661252504 is an apocalyptic number.

It is an amenable number.

25661252504 is a deficient number, since it is larger than the sum of its proper divisors (24112729096).

25661252504 is a wasteful number, since it uses less digits than its factorization.

25661252504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110608882 (or 110608878 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 38.

The spelling of 25661252504 in words is "twenty-five billion, six hundred sixty-one million, two hundred fifty-two thousand, five hundred four".