25540140400 has 120 divisors (see below), whose sum is σ = 65221209504. Its totient is φ = 9577881600.

The previous prime is 25540140397. The next prime is 25540140433. The reversal of 25540140400 is 404104552.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1781260 + ... + 1795540.

Almost surely, 2^25540140400 is an apocalyptic number.

25540140400 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 25540140400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32610604752).

25540140400 is an abundant number, since it is smaller than the sum of its proper divisors (39681069104).

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

25540140400 is a wasteful number, since it uses less digits than its factorization.

25540140400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14579 (or 14568 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

Adding to 25540140400 its reverse (404104552), we get a palindrome (25944244952).

The spelling of 25540140400 in words is "twenty-five billion, five hundred forty million, one hundred forty thousand, four hundred".