25421051560 has 64 divisors (see below), whose sum is σ = 58228470720. Its totient is φ = 9986042880.

The previous prime is 25421051543. The next prime is 25421051561. The reversal of 25421051560 is 6515012452.

It is not an unprimeable number, because it can be changed into a prime (25421051561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 872752 + ... + 901408.

It is an arithmetic number, because the mean of its divisors is an integer number (909819855).

Almost surely, 2^25421051560 is an apocalyptic number.

25421051560 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 25421051560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29114235360).

25421051560 is an abundant number, since it is smaller than the sum of its proper divisors (32807419160).

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

25421051560 is a wasteful number, since it uses less digits than its factorization.

25421051560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29066 (or 29062 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 31.

The spelling of 25421051560 in words is "twenty-five billion, four hundred twenty-one million, fifty-one thousand, five hundred sixty".