25553661725 has 12 divisors (see below), whose sum is σ = 31804342740. Its totient is φ = 20366928000.

The previous prime is 25553661713. The next prime is 25553661751. The reversal of 25553661725 is 52716635552.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 1442404441 + 24111257284 = 37979^2 + 155278^2 .

It is not a de Polignac number, because 25553661725 - 2¹⁸ = 25553399581 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25553661725.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1893176 + ... + 1906625.

It is an arithmetic number, because the mean of its divisors is an integer number (2650361895).

Almost surely, 2^25553661725 is an apocalyptic number.

25553661725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25553661725 is a deficient number, since it is larger than the sum of its proper divisors (6250681015).

25553661725 is a wasteful number, since it uses less digits than its factorization.

25553661725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3800080 (or 3800075 counting only the distinct ones).

The product of its digits is 1890000, while the sum is 47.

The spelling of 25553661725 in words is "twenty-five billion, five hundred fifty-three million, six hundred sixty-one thousand, seven hundred twenty-five".