2779661893 has 2 divisors, whose sum is σ = 2779661894. Its totient is φ = 2779661892.

The previous prime is 2779661879. The next prime is 2779661933. The reversal of 2779661893 is 3981669772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2362154404 + 417507489 = 48602^2 + 20433^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2779661893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2779661873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1389830946 + 1389830947.

It is an arithmetic number, because the mean of its divisors is an integer number (1389830947).

Almost surely, 2^2779661893 is an apocalyptic number.

It is an amenable number.

2779661893 is a deficient number, since it is larger than the sum of its proper divisors (1).

2779661893 is an equidigital number, since it uses as much as digits as its factorization.

2779661893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6858432, while the sum is 58.

The square root of 2779661893 is about 52722.4989259804. The cubic root of 2779661893 is about 1406.0388618698.

The spelling of 2779661893 in words is "two billion, seven hundred seventy-nine million, six hundred sixty-one thousand, eight hundred ninety-three".