866653199999971 has 2 divisors, whose sum is σ = 866653199999972. Its totient is φ = 866653199999970.

The previous prime is 866653199999921. The next prime is 866653200000031. The reversal of 866653199999971 is 179999991356668.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 866653199999971 - 2¹⁷ = 866653199868899 is a prime.

It is a super-2 number, since 2×866653199999971² (a number of 31 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (866653199999921) 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, 433326599999985 + 433326599999986.

It is an arithmetic number, because the mean of its divisors is an integer number (433326599999986).

Almost surely, 2^{866653199999971} is an apocalyptic number.

866653199999971 is a deficient number, since it is larger than the sum of its proper divisors (1).

866653199999971 is an equidigital number, since it uses as much as digits as its factorization.

866653199999971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96424655040, while the sum is 97.

The spelling of 866653199999971 in words is "eight hundred sixty-six trillion, six hundred fifty-three billion, one hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred seventy-one".