25520202400 has 288 divisors, whose sum is σ = 79780643712. Its totient is φ = 7738675200.

The previous prime is 25520202347. The next prime is 25520202427. The reversal of 25520202400 is 420202552.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2273602 + ... + 2284798.

It is an arithmetic number, because the mean of its divisors is an integer number (277016124).

Almost surely, 2^25520202400 is an apocalyptic number.

25520202400 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 25520202400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39890321856).

25520202400 is an abundant number, since it is smaller than the sum of its proper divisors (54260441312).

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

25520202400 is a wasteful number, since it uses less digits than its factorization.

25520202400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11272 (or 11259 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 22.

Adding to 25520202400 its reverse (420202552), we get a palindrome (25940404952).

The spelling of 25520202400 in words is "twenty-five billion, five hundred twenty million, two hundred two thousand, four hundred".