25491198944 has 24 divisors (see below), whose sum is σ = 50200532928. Its totient is φ = 12741857280.

The previous prime is 25491198881. The next prime is 25491198949. The reversal of 25491198944 is 44989119452.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 25491198944.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25491198949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4592 + ... + 225839.

It is an arithmetic number, because the mean of its divisors is an integer number (2091688872).

Almost surely, 2^25491198944 is an apocalyptic number.

It is an amenable number.

25491198944 is a deficient number, since it is larger than the sum of its proper divisors (24709333984).

25491198944 is a wasteful number, since it uses less digits than its factorization.

25491198944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233898 (or 233890 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 56.

The spelling of 25491198944 in words is "twenty-five billion, four hundred ninety-one million, one hundred ninety-eight thousand, nine hundred forty-four".