765069661 has 2 divisors, whose sum is σ = 765069662. Its totient is φ = 765069660.

The previous prime is 765069623. The next prime is 765069689. The reversal of 765069661 is 166960567.

765069661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 572692761 + 192376900 = 23931^2 + 13870^2 .

It is an emirp because it is prime and its reverse (166960567) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 765069661 - 2⁷ = 765069533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (765069601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382534830 + 382534831.

It is an arithmetic number, because the mean of its divisors is an integer number (382534831).

Almost surely, 2^765069661 is an apocalyptic number.

It is an amenable number.

765069661 is a deficient number, since it is larger than the sum of its proper divisors (1).

765069661 is an equidigital number, since it uses as much as digits as its factorization.

765069661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 46.

The square root of 765069661 is about 27659.8926425972. The cubic root of 765069661 is about 914.6051870479.

The spelling of 765069661 in words is "seven hundred sixty-five million, sixty-nine thousand, six hundred sixty-one".