25685421132 has 288 divisors, whose sum is σ = 74074828800. Its totient is φ = 6897623040.

The previous prime is 25685421131. The next prime is 25685421199. The reversal of 25685421132 is 23112458652.

It is a super-2 number, since 2×25685421132² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25685421131) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 129072369 + ... + 129072567.

Almost surely, 2^25685421132 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25685421132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37037414400).

25685421132 is an abundant number, since it is smaller than the sum of its proper divisors (48389407668).

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

25685421132 is a wasteful number, since it uses less digits than its factorization.

25685421132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421 (or 412 counting only the distinct ones).

The product of its digits is 115200, while the sum is 39.

Adding to 25685421132 its reverse (23112458652), we get a palindrome (48797879784).

The spelling of 25685421132 in words is "twenty-five billion, six hundred eighty-five million, four hundred twenty-one thousand, one hundred thirty-two".