25555312500 has 96 divisors (see below), whose sum is σ = 74538871680. Its totient is φ = 6814500000.

The previous prime is 25555312483. The next prime is 25555312513. The reversal of 25555312500 is 521355552.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 923871 + ... + 951129.

It is an arithmetic number, because the mean of its divisors is an integer number (776446580).

Almost surely, 2^25555312500 is an apocalyptic number.

25555312500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25555312500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37269435840).

25555312500 is an abundant number, since it is smaller than the sum of its proper divisors (48983559180).

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

25555312500 is an frugal number, since it uses more digits than its factorization.

25555312500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27301 (or 27269 counting only the distinct ones).

The product of its (nonzero) digits is 37500, while the sum is 33.

The spelling of 25555312500 in words is "twenty-five billion, five hundred fifty-five million, three hundred twelve thousand, five hundred".