764618744665 has 4 divisors (see below), whose sum is σ = 917542493604. Its totient is φ = 611694995728.

The previous prime is 764618744611. The next prime is 764618744711. The reversal of 764618744665 is 566447816467.

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 513485463241 + 251133281424 = 716579^2 + 501132^2 .

It is a cyclic number.

It is not a de Polignac number, because 764618744665 - 2³⁵ = 730259006297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 764618744597 and 764618744606.

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, 76461874462 + ... + 76461874471.

It is an arithmetic number, because the mean of its divisors is an integer number (229385623401).

Almost surely, 2^764618744665 is an apocalyptic number.

It is an amenable number.

764618744665 is a deficient number, since it is larger than the sum of its proper divisors (152923748939).

764618744665 is a wasteful number, since it uses less digits than its factorization.

764618744665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152923748938.

The product of its digits is 162570240, while the sum is 64.

The spelling of 764618744665 in words is "seven hundred sixty-four billion, six hundred eighteen million, seven hundred forty-four thousand, six hundred sixty-five".