25081792638 has 64 divisors (see below), whose sum is σ = 58229760000. Its totient is φ = 7053897312.

The previous prime is 25081792633. The next prime is 25081792649. The reversal of 25081792638 is 83629718052.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25081792633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5014863 + ... + 5019861.

It is an arithmetic number, because the mean of its divisors is an integer number (909840000).

Almost surely, 2^25081792638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25081792638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29114880000).

25081792638 is an abundant number, since it is smaller than the sum of its proper divisors (33147967362).

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

25081792638 is a wasteful number, since it uses less digits than its factorization.

25081792638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6861.

The product of its (nonzero) digits is 1451520, while the sum is 51.

The spelling of 25081792638 in words is "twenty-five billion, eighty-one million, seven hundred ninety-two thousand, six hundred thirty-eight".