25491897244 has 48 divisors (see below), whose sum is σ = 49287603456. Its totient is φ = 11439993600.

The previous prime is 25491897241. The next prime is 25491897247. The reversal of 25491897244 is 44279819452.

It is an interprime number because it is at equal distance from previous prime (25491897241) and next prime (25491897247).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25491897241) 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, 1518939 + ... + 1535629.

It is an arithmetic number, because the mean of its divisors is an integer number (1026825072).

Almost surely, 2^25491897244 is an apocalyptic number.

It is an amenable number.

25491897244 is a deficient number, since it is larger than the sum of its proper divisors (23795706212).

25491897244 is a wasteful number, since it uses less digits than its factorization.

25491897244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17146 (or 17144 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 55.

The spelling of 25491897244 in words is "twenty-five billion, four hundred ninety-one million, eight hundred ninety-seven thousand, two hundred forty-four".