765816761 has 2 divisors, whose sum is σ = 765816762. Its totient is φ = 765816760.

The previous prime is 765816691. The next prime is 765816773. The reversal of 765816761 is 167618567.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 749664400 + 16152361 = 27380^2 + 4019^2 .

It is a cyclic number.

It is not a de Polignac number, because 765816761 - 2¹⁰ = 765815737 is a prime.

It is a super-2 number, since 2×765816761² = 1172950622857062242, which contains 22 as substring.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (765816791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382908380 + 382908381.

It is an arithmetic number, because the mean of its divisors is an integer number (382908381).

Almost surely, 2^765816761 is an apocalyptic number.

It is an amenable number.

765816761 is a deficient number, since it is larger than the sum of its proper divisors (1).

765816761 is an equidigital number, since it uses as much as digits as its factorization.

765816761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 47.

The square root of 765816761 is about 27673.3944611065. The cubic root of 765816761 is about 914.9027979597.

The spelling of 765816761 in words is "seven hundred sixty-five million, eight hundred sixteen thousand, seven hundred sixty-one".