25505442400 has 72 divisors (see below), whose sum is σ = 62638334640. Its totient is φ = 10141032960.

The previous prime is 25505442383. The next prime is 25505442437. The reversal of 25505442400 is 424450552.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38146 + ... + 229054.

It is an arithmetic number, because the mean of its divisors is an integer number (869976870).

Almost surely, 2^25505442400 is an apocalyptic number.

25505442400 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 25505442400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31319167320).

25505442400 is an abundant number, since it is smaller than the sum of its proper divisors (37132892240).

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

25505442400 is a wasteful number, since it uses less digits than its factorization.

25505442400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191096 (or 191083 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 31.

Adding to 25505442400 its reverse (424450552), we get a palindrome (25929892952).

The spelling of 25505442400 in words is "twenty-five billion, five hundred five million, four hundred forty-two thousand, four hundred".