2543855864 has 32 divisors (see below), whose sum is σ = 5207770800. Its totient is φ = 1155313920.

The previous prime is 2543855863. The next prime is 2543855917. The reversal of 2543855864 is 4685583452.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2543855861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97172 + ... + 120540.

Almost surely, 2^2543855864 is an apocalyptic number.

It is an amenable number.

2543855864 is an abundant number, since it is smaller than the sum of its proper divisors (2663914936).

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

2543855864 is a wasteful number, since it uses less digits than its factorization.

2543855864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24623 (or 24619 counting only the distinct ones).

The product of its digits is 4608000, while the sum is 50.

The square root of 2543855864 is about 50436.6519903929. The cubic root of 2543855864 is about 1365.0990574259.

The spelling of 2543855864 in words is "two billion, five hundred forty-three million, eight hundred fifty-five thousand, eight hundred sixty-four".