764064678661 has 2 divisors, whose sum is σ = 764064678662. Its totient is φ = 764064678660.

The previous prime is 764064678631. The next prime is 764064678667. The reversal of 764064678661 is 166876460467.

764064678661 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., 668602217761 + 95462460900 = 817681^2 + 308970^2 .

It is a cyclic number.

It is not a de Polignac number, because 764064678661 - 2⁹ = 764064678149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 764064678661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (764064678667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382032339330 + 382032339331.

It is an arithmetic number, because the mean of its divisors is an integer number (382032339331).

Almost surely, 2^764064678661 is an apocalyptic number.

It is an amenable number.

764064678661 is a deficient number, since it is larger than the sum of its proper divisors (1).

764064678661 is an equidigital number, since it uses as much as digits as its factorization.

764064678661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48771072, while the sum is 61.

The spelling of 764064678661 in words is "seven hundred sixty-four billion, sixty-four million, six hundred seventy-eight thousand, six hundred sixty-one".