25912220544 has 256 divisors, whose sum is σ = 87577689600. Its totient is φ = 7388651520.

The previous prime is 25912220519. The next prime is 25912220557. The reversal of 25912220544 is 44502221952.

25912220544 is a `hidden beast` number, since 2 + 5 + 91 + 2 + 2 + 20 + 544 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 25912220499 and 25912220508.

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, 19038424 + ... + 19039784.

It is an arithmetic number, because the mean of its divisors is an integer number (342100350).

Almost surely, 2^25912220544 is an apocalyptic number.

25912220544 is a gapful number since it is divisible by the number (24) 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 25912220544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43788844800).

25912220544 is an abundant number, since it is smaller than the sum of its proper divisors (61665469056).

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

25912220544 is a wasteful number, since it uses less digits than its factorization.

25912220544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2178 (or 2160 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The spelling of 25912220544 in words is "twenty-five billion, nine hundred twelve million, two hundred twenty thousand, five hundred forty-four".