25529150538 has 80 divisors (see below), whose sum is σ = 60330193440. Its totient is φ = 8046410400.

The previous prime is 25529150531. The next prime is 25529150561. The reversal of 25529150538 is 83505192552.

It is a happy number.

25529150538 is a `hidden beast` number, since 2 + 5 + 52 + 91 + 505 + 3 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 25529150493 and 25529150502.

It is not an unprimeable number, because it can be changed into a prime (25529150531) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1657533 + ... + 1672863.

It is an arithmetic number, because the mean of its divisors is an integer number (754127418).

Almost surely, 2^25529150538 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25529150538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30165096720).

25529150538 is an abundant number, since it is smaller than the sum of its proper divisors (34801042902).

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

25529150538 is a wasteful number, since it uses less digits than its factorization.

25529150538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15905 (or 15896 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 45.

The spelling of 25529150538 in words is "twenty-five billion, five hundred twenty-nine million, one hundred fifty thousand, five hundred thirty-eight".