866788524668431 has 2 divisors, whose sum is σ = 866788524668432. Its totient is φ = 866788524668430.

The previous prime is 866788524668411. The next prime is 866788524668543. The reversal of 866788524668431 is 134866425887668.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 866788524668431 - 2⁷ = 866788524668303 is a prime.

It is a super-2 number, since 2×866788524668431² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866788524668411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433394262334215 + 433394262334216.

It is an arithmetic number, because the mean of its divisors is an integer number (433394262334216).

Almost surely, 2^{866788524668431} is an apocalyptic number.

866788524668431 is a deficient number, since it is larger than the sum of its proper divisors (1).

866788524668431 is an equidigital number, since it uses as much as digits as its factorization.

866788524668431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17836277760, while the sum is 82.

The spelling of 866788524668431 in words is "eight hundred sixty-six trillion, seven hundred eighty-eight billion, five hundred twenty-four million, six hundred sixty-eight thousand, four hundred thirty-one".