866788524670361 has 2 divisors, whose sum is σ = 866788524670362. Its totient is φ = 866788524670360.

The previous prime is 866788524670357. The next prime is 866788524670417. The reversal of 866788524670361 is 163076425887668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 506667461025625 + 360121063644736 = 22509275^2 + 18976856^2 .

It is a cyclic number.

It is not a de Polignac number, because 866788524670361 - 2² = 866788524670357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433394262335180 + 433394262335181.

It is an arithmetic number, because the mean of its divisors is an integer number (433394262335181).

Almost surely, 2^{866788524670361} is an apocalyptic number.

It is an amenable number.

866788524670361 is a deficient number, since it is larger than the sum of its proper divisors (1).

866788524670361 is an equidigital number, since it uses as much as digits as its factorization.

866788524670361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3901685760, while the sum is 77.

The spelling of 866788524670361 in words is "eight hundred sixty-six trillion, seven hundred eighty-eight billion, five hundred twenty-four million, six hundred seventy thousand, three hundred sixty-one".