25531545340 has 96 divisors (see below), whose sum is σ = 62233920000. Its totient is φ = 8617541376.

The previous prime is 25531545331. The next prime is 25531545371. The reversal of 25531545340 is 4354513552.

It is a self number, because there is not a number n which added to its sum of digits gives 25531545340.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3400911 + ... + 3408409.

It is an arithmetic number, because the mean of its divisors is an integer number (648270000).

Almost surely, 2^25531545340 is an apocalyptic number.

25531545340 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 25531545340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31116960000).

25531545340 is an abundant number, since it is smaller than the sum of its proper divisors (36702374660).

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

25531545340 is a wasteful number, since it uses less digits than its factorization.

25531545340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7891 (or 7889 counting only the distinct ones).

The product of its (nonzero) digits is 180000, while the sum is 37.

The spelling of 25531545340 in words is "twenty-five billion, five hundred thirty-one million, five hundred forty-five thousand, three hundred forty".