25540880847840 has 120 divisors (see below), whose sum is σ = 90138025371240. Its totient is φ = 6810901555968.

The previous prime is 25540880847829. The next prime is 25540880847841. The reversal of 25540880847840 is 4874808804552.

25540880847840 is a `hidden beast` number, since 2 + 5 + 5 + 40 + 8 + 80 + 8 + 478 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25540880847841) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 985360530 + ... + 985386449.

It is an arithmetic number, because the mean of its divisors is an integer number (751150211427).

Almost surely, 2^{25540880847840} is an apocalyptic number.

25540880847840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25540880847840 is an abundant number, since it is smaller than the sum of its proper divisors (64597144523400).

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

25540880847840 is a wasteful number, since it uses less digits than its factorization.

25540880847840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1970747006 (or 1970746989 counting only the distinct ones).

The product of its (nonzero) digits is 91750400, while the sum is 63.

The spelling of 25540880847840 in words is "twenty-five trillion, five hundred forty billion, eight hundred eighty million, eight hundred forty-seven thousand, eight hundred forty".