25553178240 has 128 divisors (see below), whose sum is σ = 82666854720. Its totient is φ = 6712442880.

The previous prime is 25553178239. The next prime is 25553178253. The reversal of 25553178240 is 4287135552.

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 25553178192 and 25553178201.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29320 + ... + 227960.

Almost surely, 2^25553178240 is an apocalyptic number.

25553178240 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 25553178240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41333427360).

25553178240 is an abundant number, since it is smaller than the sum of its proper divisors (57113676480).

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

25553178240 is a wasteful number, since it uses less digits than its factorization.

25553178240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198730 (or 198718 counting only the distinct ones).

The product of its (nonzero) digits is 336000, while the sum is 42.

The spelling of 25553178240 in words is "twenty-five billion, five hundred fifty-three million, one hundred seventy-eight thousand, two hundred forty".