25515506576 has 80 divisors (see below), whose sum is σ = 57912960000. Its totient is φ = 10885658112.

The previous prime is 25515506557. The next prime is 25515506587. The reversal of 25515506576 is 67560551552.

It is a self number, because there is not a number n which added to its sum of digits gives 25515506576.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1213400 + ... + 1234248.

It is an arithmetic number, because the mean of its divisors is an integer number (723912000).

Almost surely, 2^25515506576 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25515506576, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28956480000).

25515506576 is an abundant number, since it is smaller than the sum of its proper divisors (32397453424).

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

25515506576 is a wasteful number, since it uses less digits than its factorization.

25515506576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21101 (or 21081 counting only the distinct ones).

The product of its (nonzero) digits is 1575000, while the sum is 47.

The spelling of 25515506576 in words is "twenty-five billion, five hundred fifteen million, five hundred six thousand, five hundred seventy-six".