766600765991 has 2 divisors, whose sum is σ = 766600765992. Its totient is φ = 766600765990.

The previous prime is 766600765963. The next prime is 766600766081. The reversal of 766600765991 is 199567006667.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 766600765991 - 2¹⁰ = 766600764967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (766600765921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 383300382995 + 383300382996.

It is an arithmetic number, because the mean of its divisors is an integer number (383300382996).

Almost surely, 2^766600765991 is an apocalyptic number.

766600765991 is a deficient number, since it is larger than the sum of its proper divisors (1).

766600765991 is an equidigital number, since it uses as much as digits as its factorization.

766600765991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25719120, while the sum is 62.

The spelling of 766600765991 in words is "seven hundred sixty-six billion, six hundred million, seven hundred sixty-five thousand, nine hundred ninety-one".