25492561920 has 896 divisors, whose sum is σ = 107577331200. Its totient is φ = 5605687296.

The previous prime is 25492561907. The next prime is 25492561931. The reversal of 25492561920 is 2916529452.

25492561920 is a `hidden beast` number, since 2 + 5 + 4 + 9 + 2 + 5 + 619 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (896).

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 286433236 + ... + 286433324.

Almost surely, 2^25492561920 is an apocalyptic number.

25492561920 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 25492561920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53788665600).

25492561920 is an abundant number, since it is smaller than the sum of its proper divisors (82084769280).

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

25492561920 is an equidigital number, since it uses as much as digits as its factorization.

25492561920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173 (or 143 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The spelling of 25492561920 in words is "twenty-five billion, four hundred ninety-two million, five hundred sixty-one thousand, nine hundred twenty".