25780615752440 has 16 divisors (see below), whose sum is σ = 58006385443080. Its totient is φ = 10312246300960.

The previous prime is 25780615752421. The next prime is 25780615752487. The reversal of 25780615752440 is 4425751608752.

It is a congruent number.

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, 322257696866 + ... + 322257696945.

Almost surely, 2^{25780615752440} is an apocalyptic number.

25780615752440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25780615752440 is an abundant number, since it is smaller than the sum of its proper divisors (32225769690640).

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

25780615752440 is a wasteful number, since it uses less digits than its factorization.

25780615752440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644515393822 (or 644515393818 counting only the distinct ones).

The product of its (nonzero) digits is 18816000, while the sum is 56.

The spelling of 25780615752440 in words is "twenty-five trillion, seven hundred eighty billion, six hundred fifteen million, seven hundred fifty-two thousand, four hundred forty".