765264661 has 4 divisors (see below), whose sum is σ = 874588192. Its totient is φ = 655941132.

The previous prime is 765264637. The next prime is 765264677. The reversal of 765264661 is 166462567.

It is a happy number.

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 not a de Polignac number, because 765264661 - 2¹¹ = 765262613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (765268661) 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, 54661755 + ... + 54661768.

It is an arithmetic number, because the mean of its divisors is an integer number (218647048).

Almost surely, 2^765264661 is an apocalyptic number.

It is an amenable number.

765264661 is a deficient number, since it is larger than the sum of its proper divisors (109323531).

765264661 is a wasteful number, since it uses less digits than its factorization.

765264661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109323530.

The product of its digits is 362880, while the sum is 43.

The square root of 765264661 is about 27663.4173774680. The cubic root of 765264661 is about 914.6828849231.

The spelling of 765264661 in words is "seven hundred sixty-five million, two hundred sixty-four thousand, six hundred sixty-one".