773968565 has 4 divisors (see below), whose sum is σ = 928762284. Its totient is φ = 619174848.

The previous prime is 773968543. The next prime is 773968589. The reversal of 773968565 is 565869377.

773968565 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 517744516 + 256224049 = 22754^2 + 16007^2 .

It is a cyclic number.

It is not a de Polignac number, because 773968565 - 2²⁶ = 706859701 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 773968565.

It is a congruent number.

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, 77396852 + ... + 77396861.

It is an arithmetic number, because the mean of its divisors is an integer number (232190571).

Almost surely, 2^773968565 is an apocalyptic number.

It is an amenable number.

773968565 is a deficient number, since it is larger than the sum of its proper divisors (154793719).

773968565 is a wasteful number, since it uses less digits than its factorization.

773968565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154793718.

The product of its digits is 9525600, while the sum is 56.

The square root of 773968565 is about 27820.2905268798. The cubic root of 773968565 is about 918.1376017346.

The spelling of 773968565 in words is "seven hundred seventy-three million, nine hundred sixty-eight thousand, five hundred sixty-five".