25561863546 has 8 divisors (see below), whose sum is σ = 51123727104. Its totient is φ = 8520621180.

The previous prime is 25561863529. The next prime is 25561863557. The reversal of 25561863546 is 64536816552.

It is a sphenic number, since it is the product of 3 distinct primes.

25561863546 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2130155290 + ... + 2130155301.

It is an arithmetic number, because the mean of its divisors is an integer number (6390465888).

Almost surely, 2^25561863546 is an apocalyptic number.

25561863546 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

25561863546 is a wasteful number, since it uses less digits than its factorization.

25561863546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4260310596.

The product of its digits is 5184000, while the sum is 51.

The spelling of 25561863546 in words is "twenty-five billion, five hundred sixty-one million, eight hundred sixty-three thousand, five hundred forty-six".