866320769 has 2 divisors, whose sum is σ = 866320770. Its totient is φ = 866320768.

The previous prime is 866320739. The next prime is 866320811. The reversal of 866320769 is 967023668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 538240000 + 328080769 = 23200^2 + 18113^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866320769 is a prime.

It is a super-2 number, since 2×866320769² = 1501023349601502722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (866320709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433160384 + 433160385.

It is an arithmetic number, because the mean of its divisors is an integer number (433160385).

Almost surely, 2^866320769 is an apocalyptic number.

It is an amenable number.

866320769 is a deficient number, since it is larger than the sum of its proper divisors (1).

866320769 is an equidigital number, since it uses as much as digits as its factorization.

866320769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 47.

The square root of 866320769 is about 29433.3275217057. The cubic root of 866320769 is about 953.2926445080.

The spelling of 866320769 in words is "eight hundred sixty-six million, three hundred twenty thousand, seven hundred sixty-nine".