766663070471321 has 2 divisors, whose sum is σ = 766663070471322. Its totient is φ = 766663070471320.

The previous prime is 766663070471303. The next prime is 766663070471381. The reversal of 766663070471321 is 123174070366667.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 603514691039296 + 163148379432025 = 24566536^2 + 12772955^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-766663070471321 is a prime.

It is not a weakly prime, because it can be changed into another prime (766663070471381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 383331535235660 + 383331535235661.

It is an arithmetic number, because the mean of its divisors is an integer number (383331535235661).

Almost surely, 2^{766663070471321} is an apocalyptic number.

It is an amenable number.

766663070471321 is a deficient number, since it is larger than the sum of its proper divisors (1).

766663070471321 is an equidigital number, since it uses as much as digits as its factorization.

766663070471321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32006016, while the sum is 59.

The spelling of 766663070471321 in words is "seven hundred sixty-six trillion, six hundred sixty-three billion, seventy million, four hundred seventy-one thousand, three hundred twenty-one".