25561544688225 has 144 divisors (see below), whose sum is σ = 59314743196800. Its totient is φ = 10218704117760.

The previous prime is 25561544688223. The next prime is 25561544688241. The reversal of 25561544688225 is 52288644516552.

25561544688225 is a `hidden beast` number, since 2 + 5 + 5 + 6 + 1 + 544 + 6 + 8 + 82 + 2 + 5 = 666.

It is not a de Polignac number, because 25561544688225 - 2¹ = 25561544688223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (25561544688223) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 32464320 + ... + 33242369.

Almost surely, 2^{25561544688225} is an apocalyptic number.

25561544688225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25561544688225 is an abundant number, since it is smaller than the sum of its proper divisors (33753198508575).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25561544688225 is a wasteful number, since it uses less digits than its factorization.

25561544688225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65706744 (or 65706736 counting only the distinct ones).

The product of its digits is 184320000, while the sum is 63.

The spelling of 25561544688225 in words is "twenty-five trillion, five hundred sixty-one billion, five hundred forty-four million, six hundred eighty-eight thousand, two hundred twenty-five".