2543658434 has 4 divisors (see below), whose sum is σ = 3815487654. Its totient is φ = 1271829216.

The previous prime is 2543658433. The next prime is 2543658443. The reversal of 2543658434 is 4348563452.

2543658434 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 2381732809 + 161925625 = 48803^2 + 12725^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2543658431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635914607 + ... + 635914610.

Almost surely, 2^2543658434 is an apocalyptic number.

2543658434 is a deficient number, since it is larger than the sum of its proper divisors (1271829220).

2543658434 is a wasteful number, since it uses less digits than its factorization.

2543658434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1271829219.

The product of its digits is 1382400, while the sum is 44.

The square root of 2543658434 is about 50434.6947447885. The cubic root of 2543658434 is about 1365.0637411588.

The spelling of 2543658434 in words is "two billion, five hundred forty-three million, six hundred fifty-eight thousand, four hundred thirty-four".