766631960641 has 2 divisors, whose sum is σ = 766631960642. Its totient is φ = 766631960640.

The previous prime is 766631960639. The next prime is 766631960651. The reversal of 766631960641 is 146069136667.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 406793942416 + 359838018225 = 637804^2 + 599865^2 .

It is a cyclic number.

It is not a de Polignac number, because 766631960641 - 2¹ = 766631960639 is a prime.

Together with 766631960639, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (766631960651) 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, 383315980320 + 383315980321.

It is an arithmetic number, because the mean of its divisors is an integer number (383315980321).

Almost surely, 2^766631960641 is an apocalyptic number.

It is an amenable number.

766631960641 is a deficient number, since it is larger than the sum of its proper divisors (1).

766631960641 is an equidigital number, since it uses as much as digits as its factorization.

766631960641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5878656, while the sum is 55.

The spelling of 766631960641 in words is "seven hundred sixty-six billion, six hundred thirty-one million, nine hundred sixty thousand, six hundred forty-one".