2659845779 has 4 divisors (see below), whose sum is σ = 2662039776. Its totient is φ = 2657651784.

The previous prime is 2659845737. The next prime is 2659845781. The reversal of 2659845779 is 9775489562.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9775489562 = 2 ⋅4887744781.

It is a cyclic number.

It is not a de Polignac number, because 2659845779 - 2²⁴ = 2643068563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2659845079) 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, 1095179 + ... + 1097604.

It is an arithmetic number, because the mean of its divisors is an integer number (665509944).

Almost surely, 2^2659845779 is an apocalyptic number.

2659845779 is a deficient number, since it is larger than the sum of its proper divisors (2193997).

2659845779 is a wasteful number, since it uses less digits than its factorization.

2659845779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2193996.

The product of its digits is 38102400, while the sum is 62.

The square root of 2659845779 is about 51573.6927027724. The cubic root of 2659845779 is about 1385.5392043535.

The spelling of 2659845779 in words is "two billion, six hundred fifty-nine million, eight hundred forty-five thousand, seven hundred seventy-nine".