766320428257 has 8 divisors (see below), whose sum is σ = 769678440552. Its totient is φ = 762966672000.

The previous prime is 766320428221. The next prime is 766320428333. The reversal of 766320428257 is 752824023667.

It can be written as a sum of positive squares in 4 ways, for example, as 7463404881 + 758857023376 = 86391^2 + 871124^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 766320428257 - 2⁷ = 766320428129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (766320428557) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 702844 + ... + 1423597.

It is an arithmetic number, because the mean of its divisors is an integer number (96209805069).

Almost surely, 2^766320428257 is an apocalyptic number.

It is an amenable number.

766320428257 is a deficient number, since it is larger than the sum of its proper divisors (3358012295).

766320428257 is a wasteful number, since it uses less digits than its factorization.

766320428257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2128019.

The product of its (nonzero) digits is 6773760, while the sum is 52.

The spelling of 766320428257 in words is "seven hundred sixty-six billion, three hundred twenty million, four hundred twenty-eight thousand, two hundred fifty-seven".