2543521563 has 24 divisors (see below), whose sum is σ = 4009876416. Its totient is φ = 1540796400.

The previous prime is 2543521529. The next prime is 2543521567. The reversal of 2543521563 is 3651253452.

2543521563 is a `hidden beast` number, since 2 + 5 + 43 + 52 + 1 + 563 = 666.

It is not a de Polignac number, because 2543521563 - 2⁸ = 2543521307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2543521567) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 263248 + ... + 272738.

It is an arithmetic number, because the mean of its divisors is an integer number (167078184).

Almost surely, 2^2543521563 is an apocalyptic number.

2543521563 is a deficient number, since it is larger than the sum of its proper divisors (1466354853).

2543521563 is a wasteful number, since it uses less digits than its factorization.

2543521563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12215 (or 12212 counting only the distinct ones).

The product of its digits is 108000, while the sum is 36.

The square root of 2543521563 is about 50433.3378133948. The cubic root of 2543521563 is about 1365.0392566096.

The spelling of 2543521563 in words is "two billion, five hundred forty-three million, five hundred twenty-one thousand, five hundred sixty-three".