765565649 has 4 divisors (see below), whose sum is σ = 798851136. Its totient is φ = 732280164.

The previous prime is 765565609. The next prime is 765565663. The reversal of 765565649 is 946565567.

It is a happy number.

765565649 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-765565649 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 765565649.

It is not an unprimeable number, because it can be changed into a prime (765565609) 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, 16642709 + ... + 16642754.

It is an arithmetic number, because the mean of its divisors is an integer number (199712784).

Almost surely, 2^765565649 is an apocalyptic number.

It is an amenable number.

765565649 is a deficient number, since it is larger than the sum of its proper divisors (33285487).

765565649 is a wasteful number, since it uses less digits than its factorization.

765565649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33285486.

The product of its digits is 6804000, while the sum is 53.

The square root of 765565649 is about 27668.8570237370. The cubic root of 765565649 is about 914.8027878796.

The spelling of 765565649 in words is "seven hundred sixty-five million, five hundred sixty-five thousand, six hundred forty-nine".