2543745457 has 4 divisors (see below), whose sum is σ = 2774995056. Its totient is φ = 2312495860.

The previous prime is 2543745443. The next prime is 2543745487. The reversal of 2543745457 is 7545473452.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2543745457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2543745437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115624783 + ... + 115624804.

It is an arithmetic number, because the mean of its divisors is an integer number (693748764).

Almost surely, 2^2543745457 is an apocalyptic number.

It is an amenable number.

2543745457 is a deficient number, since it is larger than the sum of its proper divisors (231249599).

2543745457 is a wasteful number, since it uses less digits than its factorization.

2543745457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231249598.

The product of its digits is 2352000, while the sum is 46.

The square root of 2543745457 is about 50435.5574669300. The cubic root of 2543745457 is about 1365.0793080533.

The spelling of 2543745457 in words is "two billion, five hundred forty-three million, seven hundred forty-five thousand, four hundred fifty-seven".