2505065856 has 128 divisors (see below), whose sum is σ = 6926991360. Its totient is φ = 801239040.

The previous prime is 2505065809. The next prime is 2505065863. The reversal of 2505065856 is 6585605052.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1510980 + ... + 1512636.

It is an arithmetic number, because the mean of its divisors is an integer number (54117120).

Almost surely, 2^2505065856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2505065856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3463495680).

2505065856 is an abundant number, since it is smaller than the sum of its proper divisors (4421925504).

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

2505065856 is a wasteful number, since it uses less digits than its factorization.

2505065856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1832 (or 1820 counting only the distinct ones).

The product of its (nonzero) digits is 360000, while the sum is 42.

The square root of 2505065856 is about 50050.6329230710. The cubic root of 2505065856 is about 1358.1249130465.

The spelling of 2505065856 in words is "two billion, five hundred five million, sixty-five thousand, eight hundred fifty-six".