25449538560 has 176 divisors, whose sum is σ = 86187805056. Its totient is φ = 6387269632.

The previous prime is 25449538559. The next prime is 25449538561. The reversal of 25449538560 is 6583594452.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25449538559) and next prime (25449538561).

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (25449538561) 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, 212389 + ... + 309851.

Almost surely, 2^25449538560 is an apocalyptic number.

25449538560 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 25449538560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43093902528).

25449538560 is an abundant number, since it is smaller than the sum of its proper divisors (60738266496).

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

25449538560 is a wasteful number, since it uses less digits than its factorization.

25449538560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97508 (or 97490 counting only the distinct ones).

The product of its (nonzero) digits is 5184000, while the sum is 51.

The spelling of 25449538560 in words is "twenty-five billion, four hundred forty-nine million, five hundred thirty-eight thousand, five hundred sixty".