25557449120 has 288 divisors, whose sum is σ = 76512377088. Its totient is φ = 7886241792.

The previous prime is 25557449101. The next prime is 25557449131. The reversal of 25557449120 is 2194475552.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7442924 + ... + 7446356.

It is an arithmetic number, because the mean of its divisors is an integer number (265667976).

Almost surely, 2^25557449120 is an apocalyptic number.

25557449120 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 25557449120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38256188544).

25557449120 is an abundant number, since it is smaller than the sum of its proper divisors (50954927968).

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

25557449120 is a wasteful number, since it uses less digits than its factorization.

25557449120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3512 (or 3487 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 44.

The spelling of 25557449120 in words is "twenty-five billion, five hundred fifty-seven million, four hundred forty-nine thousand, one hundred twenty".