866350730521 has 2 divisors, whose sum is σ = 866350730522. Its totient is φ = 866350730520.

The previous prime is 866350730503. The next prime is 866350730551. The reversal of 866350730521 is 125037053668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 723289015296 + 143061715225 = 850464^2 + 378235^2 .

It is a cyclic number.

It is not a de Polignac number, because 866350730521 - 2²⁷ = 866216512793 is a prime.

It is not a weakly prime, because it can be changed into another prime (866350730551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433175365260 + 433175365261.

It is an arithmetic number, because the mean of its divisors is an integer number (433175365261).

Almost surely, 2^866350730521 is an apocalyptic number.

It is an amenable number.

866350730521 is a deficient number, since it is larger than the sum of its proper divisors (1).

866350730521 is an equidigital number, since it uses as much as digits as its factorization.

866350730521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 907200, while the sum is 46.

The spelling of 866350730521 in words is "eight hundred sixty-six billion, three hundred fifty million, seven hundred thirty thousand, five hundred twenty-one".