2543555842 has 4 divisors (see below), whose sum is σ = 3815333766. Its totient is φ = 1271777920.

The previous prime is 2543555801. The next prime is 2543555843. The reversal of 2543555842 is 2485553452.

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

It can be written as a sum of positive squares in only one way, i.e., 2283023961 + 260531881 = 47781^2 + 16141^2 .

It is not an unprimeable number, because it can be changed into a prime (2543555843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635888959 + ... + 635888962.

Almost surely, 2^2543555842 is an apocalyptic number.

2543555842 is a deficient number, since it is larger than the sum of its proper divisors (1271777924).

2543555842 is a wasteful number, since it uses less digits than its factorization.

2543555842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1271777923.

The product of its digits is 960000, while the sum is 43.

The square root of 2543555842 is about 50433.6776568991. The cubic root of 2543555842 is about 1365.0453887862.

The spelling of 2543555842 in words is "two billion, five hundred forty-three million, five hundred fifty-five thousand, eight hundred forty-two".