25438277148 has 96 divisors (see below), whose sum is σ = 67943635200. Its totient is φ = 7356220416.

The previous prime is 25438277107. The next prime is 25438277149. The reversal of 25438277148 is 84177283452.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 25438277148.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25438277149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54723 + ... + 232101.

It is an arithmetic number, because the mean of its divisors is an integer number (707746200).

Almost surely, 2^25438277148 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 25438277148, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33971817600).

25438277148 is an abundant number, since it is smaller than the sum of its proper divisors (42505358052).

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

25438277148 is a wasteful number, since it uses less digits than its factorization.

25438277148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177459 (or 177457 counting only the distinct ones).

The product of its digits is 3010560, while the sum is 51.

The spelling of 25438277148 in words is "twenty-five billion, four hundred thirty-eight million, two hundred seventy-seven thousand, one hundred forty-eight".