25131663556550 has 96 divisors (see below), whose sum is σ = 47199813607872. Its totient is φ = 9955356180480.

The previous prime is 25131663556547. The next prime is 25131663556561. The reversal of 25131663556550 is 5565536613152.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25131663556492 and 25131663556501.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6936698039 + ... + 6936701661.

It is an arithmetic number, because the mean of its divisors is an integer number (491664725082).

Almost surely, 2^{25131663556550} is an apocalyptic number.

25131663556550 is a deficient number, since it is larger than the sum of its proper divisors (22068150051322).

25131663556550 is a wasteful number, since it uses less digits than its factorization.

25131663556550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6882 (or 6877 counting only the distinct ones).

The product of its (nonzero) digits is 12150000, while the sum is 53.

The spelling of 25131663556550 in words is "twenty-five trillion, one hundred thirty-one billion, six hundred sixty-three million, five hundred fifty-six thousand, five hundred fifty".