866486930557 has 2 divisors, whose sum is σ = 866486930558. Its totient is φ = 866486930556.

The previous prime is 866486930549. The next prime is 866486930609. The reversal of 866486930557 is 755039684668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 456913810116 + 409573120441 = 675954^2 + 639979^2 .

It is a cyclic number.

It is not a de Polignac number, because 866486930557 - 2³ = 866486930549 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 866486930492 and 866486930501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866486930527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433243465278 + 433243465279.

It is an arithmetic number, because the mean of its divisors is an integer number (433243465279).

Almost surely, 2^866486930557 is an apocalyptic number.

It is an amenable number.

866486930557 is a deficient number, since it is larger than the sum of its proper divisors (1).

866486930557 is an equidigital number, since it uses as much as digits as its factorization.

866486930557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 261273600, while the sum is 67.

The spelling of 866486930557 in words is "eight hundred sixty-six billion, four hundred eighty-six million, nine hundred thirty thousand, five hundred fifty-seven".