866788524521663 has 2 divisors, whose sum is σ = 866788524521664. Its totient is φ = 866788524521662.

The previous prime is 866788524521651. The next prime is 866788524521671. The reversal of 866788524521663 is 366125425887668.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 866788524521663 - 2¹⁸ = 866788524259519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866788524521603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433394262260831 + 433394262260832.

It is an arithmetic number, because the mean of its divisors is an integer number (433394262260832).

Almost surely, 2^{866788524521663} is an apocalyptic number.

866788524521663 is a deficient number, since it is larger than the sum of its proper divisors (1).

866788524521663 is an equidigital number, since it uses as much as digits as its factorization.

866788524521663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5573836800, while the sum is 77.

The spelling of 866788524521663 in words is "eight hundred sixty-six trillion, seven hundred eighty-eight billion, five hundred twenty-four million, five hundred twenty-one thousand, six hundred sixty-three".