866529766673 has 2 divisors, whose sum is σ = 866529766674. Its totient is φ = 866529766672.

The previous prime is 866529766607. The next prime is 866529766747. The reversal of 866529766673 is 376667925668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 629193209089 + 237336557584 = 793217^2 + 487172^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866529766673 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 866529766597 and 866529766606.

It is not a weakly prime, because it can be changed into another prime (866529766603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433264883336 + 433264883337.

It is an arithmetic number, because the mean of its divisors is an integer number (433264883337).

Almost surely, 2^866529766673 is an apocalyptic number.

It is an amenable number.

866529766673 is a deficient number, since it is larger than the sum of its proper divisors (1).

866529766673 is an equidigital number, since it uses as much as digits as its factorization.

866529766673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 823011840, while the sum is 71.

The spelling of 866529766673 in words is "eight hundred sixty-six billion, five hundred twenty-nine million, seven hundred sixty-six thousand, six hundred seventy-three".