25505417500 has 60 divisors (see below), whose sum is σ = 55814133760. Its totient is φ = 10195056000.

The previous prime is 25505417461. The next prime is 25505417519. The reversal of 25505417500 is 571450552.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4979941 + ... + 4985059.

Almost surely, 2^25505417500 is an apocalyptic number.

25505417500 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 25505417500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27907066880).

25505417500 is an abundant number, since it is smaller than the sum of its proper divisors (30308716260).

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

25505417500 is a wasteful number, since it uses less digits than its factorization.

25505417500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7136 (or 7119 counting only the distinct ones).

The product of its (nonzero) digits is 35000, while the sum is 34.

The spelling of 25505417500 in words is "twenty-five billion, five hundred five million, four hundred seventeen thousand, five hundred".