2748783665 has 4 divisors (see below), whose sum is σ = 3298540404. Its totient is φ = 2199026928.

The previous prime is 2748783649. The next prime is 2748783677. The reversal of 2748783665 is 5663878472.

2748783665 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 2 ways, for example, as 502118464 + 2246665201 = 22408^2 + 47399^2 .

It is a cyclic number.

It is not a de Polignac number, because 2748783665 - 2⁴ = 2748783649 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2748783665.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274878362 + ... + 274878371.

It is an arithmetic number, because the mean of its divisors is an integer number (824635101).

Almost surely, 2^2748783665 is an apocalyptic number.

It is an amenable number.

2748783665 is a deficient number, since it is larger than the sum of its proper divisors (549756739).

2748783665 is an equidigital number, since it uses as much as digits as its factorization.

2748783665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549756738.

The product of its digits is 13547520, while the sum is 56.

The square root of 2748783665 is about 52428.8438266571. The cubic root of 2748783665 is about 1400.8130761688.

The spelling of 2748783665 in words is "two billion, seven hundred forty-eight million, seven hundred eighty-three thousand, six hundred sixty-five".