25638261704 has 64 divisors (see below), whose sum is σ = 54024235200. Its totient is φ = 11304057600.

The previous prime is 25638261659. The next prime is 25638261707. The reversal of 25638261704 is 40716283652.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (25638261707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1065842 + ... + 1089630.

It is an arithmetic number, because the mean of its divisors is an integer number (844128675).

Almost surely, 2^25638261704 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 25638261704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27012117600).

25638261704 is an abundant number, since it is smaller than the sum of its proper divisors (28385973496).

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

25638261704 is a wasteful number, since it uses less digits than its factorization.

25638261704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24174 (or 24170 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 44.

The spelling of 25638261704 in words is "twenty-five billion, six hundred thirty-eight million, two hundred sixty-one thousand, seven hundred four".