25561033512 has 64 divisors (see below), whose sum is σ = 74031991680. Its totient is φ = 7203105792.

The previous prime is 25561033499. The next prime is 25561033513. The reversal of 25561033512 is 21533016552.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (25561033513) 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 15 ways as a sum of consecutive naturals, for example, 1029853 + ... + 1054380.

It is an arithmetic number, because the mean of its divisors is an integer number (1156749870).

Almost surely, 2^25561033512 is an apocalyptic number.

It is an amenable number.

25561033512 is an abundant number, since it is smaller than the sum of its proper divisors (48470958168).

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

25561033512 is a wasteful number, since it uses less digits than its factorization.

25561033512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2084322 (or 2084318 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 33.

The spelling of 25561033512 in words is "twenty-five billion, five hundred sixty-one million, thirty-three thousand, five hundred twelve".