2543686345 has 4 divisors (see below), whose sum is σ = 3052423620. Its totient is φ = 2034949072.

The previous prime is 2543686339. The next prime is 2543686361. The reversal of 2543686345 is 5436863452.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1672728201 + 870958144 = 40899^2 + 29512^2 .

It is a cyclic number.

It is not a de Polignac number, because 2543686345 - 2³ = 2543686337 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2543686295 and 2543686304.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254368630 + ... + 254368639.

It is an arithmetic number, because the mean of its divisors is an integer number (763105905).

Almost surely, 2^2543686345 is an apocalyptic number.

It is an amenable number.

2543686345 is a deficient number, since it is larger than the sum of its proper divisors (508737275).

2543686345 is an equidigital number, since it uses as much as digits as its factorization.

2543686345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508737274.

The product of its digits is 2073600, while the sum is 46.

The square root of 2543686345 is about 50434.9714483908. The cubic root of 2543686345 is about 1365.0687339878.

The spelling of 2543686345 in words is "two billion, five hundred forty-three million, six hundred eighty-six thousand, three hundred forty-five".