2278768165 has 4 divisors (see below), whose sum is σ = 2734521804. Its totient is φ = 1823014528.

The previous prime is 2278768153. The next prime is 2278768183. The reversal of 2278768165 is 5618678722.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5618678722 = 2 ⋅2809339361.

It can be written as a sum of positive squares in 2 ways, for example, as 1103169796 + 1175598369 = 33214^2 + 34287^2 .

It is a cyclic number.

It is not a de Polignac number, because 2278768165 - 2⁹ = 2278767653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 227876812 + ... + 227876821.

It is an arithmetic number, because the mean of its divisors is an integer number (683630451).

Almost surely, 2^2278768165 is an apocalyptic number.

It is an amenable number.

2278768165 is a deficient number, since it is larger than the sum of its proper divisors (455753639).

2278768165 is an equidigital number, since it uses as much as digits as its factorization.

2278768165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455753638.

The product of its digits is 2257920, while the sum is 52.

The square root of 2278768165 is about 47736.4448299200. Note that the first 3 decimals coincide. The cubic root of 2278768165 is about 1315.9317977622.

The spelling of 2278768165 in words is "two billion, two hundred seventy-eight million, seven hundred sixty-eight thousand, one hundred sixty-five".