25866804481 has 24 divisors (see below), whose sum is σ = 30203962560. Its totient is φ = 22087749600.

The previous prime is 25866804449. The next prime is 25866804493. The reversal of 25866804481 is 18440866852.

It is a happy number.

It is not a de Polignac number, because 25866804481 - 2⁵ = 25866804449 is a prime.

It is a super-2 number, since 2×25866804481² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25866807481) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25383990 + ... + 25385008.

It is an arithmetic number, because the mean of its divisors is an integer number (1258498440).

Almost surely, 2^25866804481 is an apocalyptic number.

It is an amenable number.

25866804481 is a deficient number, since it is larger than the sum of its proper divisors (4337158079).

25866804481 is a wasteful number, since it uses less digits than its factorization.

25866804481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2485 (or 2478 counting only the distinct ones).

The product of its (nonzero) digits is 2949120, while the sum is 52.

The spelling of 25866804481 in words is "twenty-five billion, eight hundred sixty-six million, eight hundred four thousand, four hundred eighty-one".