25543449891840 has 704 divisors, whose sum is σ = 85389927033600. Its totient is φ = 6509052297216.

The previous prime is 25543449891829. The next prime is 25543449891851. The reversal of 25543449891840 is 4819894434552.

It is an interprime number because it is at equal distance from previous prime (25543449891829) and next prime (25543449891851).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 37954605744 + ... + 37954606416.

Almost surely, 2^{25543449891840} is an apocalyptic number.

25543449891840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25543449891840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42694963516800).

25543449891840 is an abundant number, since it is smaller than the sum of its proper divisors (59846477141760).

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

25543449891840 is a wasteful number, since it uses less digits than its factorization.

25543449891840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1482 (or 1464 counting only the distinct ones).

The product of its (nonzero) digits is 199065600, while the sum is 66.

The spelling of 25543449891840 in words is "twenty-five trillion, five hundred forty-three billion, four hundred forty-nine million, eight hundred ninety-one thousand, eight hundred forty".