25166623128 has 64 divisors (see below), whose sum is σ = 66472665600. Its totient is φ = 7917989760.

The previous prime is 25166623121. The next prime is 25166623129. The reversal of 25166623128 is 82132666152.

It is a self number, because there is not a number n which added to its sum of digits gives 25166623128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25166623121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21750 + ... + 225402.

It is an arithmetic number, because the mean of its divisors is an integer number (1038635400).

Almost surely, 2^25166623128 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 25166623128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33236332800).

25166623128 is an abundant number, since it is smaller than the sum of its proper divisors (41306042472).

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

25166623128 is a wasteful number, since it uses less digits than its factorization.

25166623128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203952 (or 203948 counting only the distinct ones).

The product of its digits is 207360, while the sum is 42.

The spelling of 25166623128 in words is "twenty-five billion, one hundred sixty-six million, six hundred twenty-three thousand, one hundred twenty-eight".