25673547438 has 144 divisors (see below), whose sum is σ = 70312814208. Its totient is φ = 6626901600.

The previous prime is 25673547437. The next prime is 25673547451. The reversal of 25673547438 is 83474537652.

It is a happy number.

25673547438 is a `hidden beast` number, since 2 + 5 + 67 + 3 + 547 + 4 + 38 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25673547437) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2479933 + ... + 2490263.

It is an arithmetic number, because the mean of its divisors is an integer number (488283432).

Almost surely, 2^25673547438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25673547438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35156407104).

25673547438 is an abundant number, since it is smaller than the sum of its proper divisors (44639266770).

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

25673547438 is a wasteful number, since it uses less digits than its factorization.

25673547438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10531 (or 10517 counting only the distinct ones).

The product of its digits is 16934400, while the sum is 54.

The spelling of 25673547438 in words is "twenty-five billion, six hundred seventy-three million, five hundred forty-seven thousand, four hundred thirty-eight".