866788524670669 has 2 divisors, whose sum is σ = 866788524670670. Its totient is φ = 866788524670668.

The previous prime is 866788524670661. The next prime is 866788524670703. The reversal of 866788524670669 is 966076425887668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 576493785781225 + 290294738889444 = 24010285^2 + 17038038^2 .

It is a cyclic number.

It is not a de Polignac number, because 866788524670669 - 2³ = 866788524670661 is a prime.

It is a super-2 number, since 2×866788524670669² (a number of 31 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 866788524670669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866788524670661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433394262335334 + 433394262335335.

It is an arithmetic number, because the mean of its divisors is an integer number (433394262335335).

Almost surely, 2^{866788524670669} is an apocalyptic number.

It is an amenable number.

866788524670669 is a deficient number, since it is larger than the sum of its proper divisors (1).

866788524670669 is an equidigital number, since it uses as much as digits as its factorization.

866788524670669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70230343680, while the sum is 88.

The spelling of 866788524670669 in words is "eight hundred sixty-six trillion, seven hundred eighty-eight billion, five hundred twenty-four million, six hundred seventy thousand, six hundred sixty-nine".