25491840000 has 880 divisors, whose sum is σ = 99452365056. Its totient is φ = 5734400000.

The previous prime is 25491839963. The next prime is 25491840019. The reversal of 25491840000 is 4819452.

It is a tau number, because it is divible by the number of its divisors (880).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 359039965 + ... + 359040035.

Almost surely, 2^25491840000 is an apocalyptic number.

25491840000 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 25491840000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49726182528).

25491840000 is an abundant number, since it is smaller than the sum of its proper divisors (73960525056).

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

25491840000 is a wasteful number, since it uses less digits than its factorization.

25491840000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142 (or 109 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The spelling of 25491840000 in words is "twenty-five billion, four hundred ninety-one million, eight hundred forty thousand".