25441566440 has 16 divisors (see below), whose sum is σ = 57243524580. Its totient is φ = 10176626560.

The previous prime is 25441566439. The next prime is 25441566463. The reversal of 25441566440 is 4466514452.

It can be written as a sum of positive squares in 2 ways, for example, as 25394972164 + 46594276 = 159358^2 + 6826^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 318019541 + ... + 318019620.

Almost surely, 2^25441566440 is an apocalyptic number.

25441566440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25441566440 is an abundant number, since it is smaller than the sum of its proper divisors (31801958140).

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

25441566440 is a wasteful number, since it uses less digits than its factorization.

25441566440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636039172 (or 636039168 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 41.

The spelling of 25441566440 in words is "twenty-five billion, four hundred forty-one million, five hundred sixty-six thousand, four hundred forty".