25591467840 has 224 divisors, whose sum is σ = 85784862720. Its totient is φ = 6445910016.

The previous prime is 25591467833. The next prime is 25591467857. The reversal of 25591467840 is 4876419552.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6692169 + ... + 6695991.

Almost surely, 2^25591467840 is an apocalyptic number.

25591467840 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 25591467840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42892431360).

25591467840 is an abundant number, since it is smaller than the sum of its proper divisors (60193394880).

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

25591467840 is a wasteful number, since it uses less digits than its factorization.

25591467840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4229 (or 4219 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 51.

The spelling of 25591467840 in words is "twenty-five billion, five hundred ninety-one million, four hundred sixty-seven thousand, eight hundred forty".