8397817855111 has 2 divisors, whose sum is σ = 8397817855112. Its totient is φ = 8397817855110.

The previous prime is 8397817855109. The next prime is 8397817855139. The reversal of 8397817855111 is 1115587187938.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8397817855111 - 2¹ = 8397817855109 is a prime.

It is a super-2 number, since 2×8397817855111² (a number of 27 digits) contains 22 as substring.

Together with 8397817855109, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8397817855181) 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, 4198908927555 + 4198908927556.

It is an arithmetic number, because the mean of its divisors is an integer number (4198908927556).

Almost surely, 2^{8397817855111} is an apocalyptic number.

8397817855111 is a deficient number, since it is larger than the sum of its proper divisors (1).

8397817855111 is an equidigital number, since it uses as much as digits as its factorization.

8397817855111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16934400, while the sum is 64.

The spelling of 8397817855111 in words is "eight trillion, three hundred ninety-seven billion, eight hundred seventeen million, eight hundred fifty-five thousand, one hundred eleven".