25445253240 has 192 divisors, whose sum is σ = 90544577760. Its totient is φ = 6146012160.

The previous prime is 25445253221. The next prime is 25445253241. The reversal of 25445253240 is 4235254452.

25445253240 is a `hidden beast` number, since 25 + 44 + 525 + 32 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 25445253195 and 25445253204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25445253241) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1085322 + ... + 1108518.

Almost surely, 2^25445253240 is an apocalyptic number.

25445253240 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 25445253240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45272288880).

25445253240 is an abundant number, since it is smaller than the sum of its proper divisors (65099324520).

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

25445253240 is a wasteful number, since it uses less digits than its factorization.

25445253240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23502 (or 23495 counting only the distinct ones).

The product of its (nonzero) digits is 192000, while the sum is 36.

The spelling of 25445253240 in words is "twenty-five billion, four hundred forty-five million, two hundred fifty-three thousand, two hundred forty".