2543778879 has 4 divisors (see below), whose sum is σ = 3391705176. Its totient is φ = 1695852584.

The previous prime is 2543778871. The next prime is 2543778911. The reversal of 2543778879 is 9788773452.

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

It is a cyclic number.

It is not a de Polignac number, because 2543778879 - 2³ = 2543778871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2543778871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 423963144 + ... + 423963149.

It is an arithmetic number, because the mean of its divisors is an integer number (847926294).

Almost surely, 2^2543778879 is an apocalyptic number.

2543778879 is a deficient number, since it is larger than the sum of its proper divisors (847926297).

2543778879 is an equidigital number, since it uses as much as digits as its factorization.

2543778879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847926296.

The product of its digits is 23708160, while the sum is 60.

The square root of 2543778879 is about 50435.8887995443. Note that the first 3 decimals coincide. The cubic root of 2543778879 is about 1365.0852865709.

The spelling of 2543778879 in words is "two billion, five hundred forty-three million, seven hundred seventy-eight thousand, eight hundred seventy-nine".