25491038112 has 144 divisors (see below), whose sum is σ = 76851919872. Its totient is φ = 8000570880.

The previous prime is 25491038071. The next prime is 25491038123. The reversal of 25491038112 is 21183019452.

25491038112 is a `hidden beast` number, since 2 + 549 + 103 + 8 + 1 + 1 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 291753 + ... + 368919.

It is an arithmetic number, because the mean of its divisors is an integer number (533693888).

Almost surely, 2^25491038112 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 25491038112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38425959936).

25491038112 is an abundant number, since it is smaller than the sum of its proper divisors (51360881760).

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

25491038112 is a wasteful number, since it uses less digits than its factorization.

25491038112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77251 (or 77240 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The spelling of 25491038112 in words is "twenty-five billion, four hundred ninety-one million, thirty-eight thousand, one hundred twelve".