766066672277021 has 2 divisors, whose sum is σ = 766066672277022. Its totient is φ = 766066672277020.

The previous prime is 766066672276981. The next prime is 766066672277117. The reversal of 766066672277021 is 120772276660667.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 650357818468996 + 115708853808025 = 25502114^2 + 10756805^2 .

It is a cyclic number.

It is not a de Polignac number, because 766066672277021 - 2²⁶ = 766066605168157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (766066672277521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 383033336138510 + 383033336138511.

It is an arithmetic number, because the mean of its divisors is an integer number (383033336138511).

Almost surely, 2^{766066672277021} is an apocalyptic number.

It is an amenable number.

766066672277021 is a deficient number, since it is larger than the sum of its proper divisors (1).

766066672277021 is an equidigital number, since it uses as much as digits as its factorization.

766066672277021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 149361408, while the sum is 65.

The spelling of 766066672277021 in words is "seven hundred sixty-six trillion, sixty-six billion, six hundred seventy-two million, two hundred seventy-seven thousand, twenty-one".