764431646813 has 4 divisors (see below), whose sum is σ = 769562060700. Its totient is φ = 759301232928.

The previous prime is 764431646777. The next prime is 764431646843. The reversal of 764431646813 is 318646134467.

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 82086261049 + 682345385764 = 286507^2 + 826042^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-764431646813 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 (764431646843) 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, 2565206720 + ... + 2565207017.

It is an arithmetic number, because the mean of its divisors is an integer number (192390515175).

Almost surely, 2^764431646813 is an apocalyptic number.

It is an amenable number.

764431646813 is a deficient number, since it is larger than the sum of its proper divisors (5130413887).

764431646813 is a wasteful number, since it uses less digits than its factorization.

764431646813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5130413886.

The product of its digits is 6967296, while the sum is 53.

The spelling of 764431646813 in words is "seven hundred sixty-four billion, four hundred thirty-one million, six hundred forty-six thousand, eight hundred thirteen".