25243400205520 has 40 divisors (see below), whose sum is σ = 67075320547584. Its totient is φ = 8654880070272.

The previous prime is 25243400205503. The next prime is 25243400205587. The reversal of 25243400205520 is 2550200434252.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22538749624 + ... + 22538750743.

Almost surely, 2^{25243400205520} is an apocalyptic number.

25243400205520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25243400205520 is an abundant number, since it is smaller than the sum of its proper divisors (41831920342064).

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

25243400205520 is a wasteful number, since it uses less digits than its factorization.

25243400205520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45077500387 (or 45077500381 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 34.

Adding to 25243400205520 its reverse (2550200434252), we get a palindrome (27793600639772).

The spelling of 25243400205520 in words is "twenty-five trillion, two hundred forty-three billion, four hundred million, two hundred five thousand, five hundred twenty".