1156168411681 has 2 divisors, whose sum is σ = 1156168411682. Its totient is φ = 1156168411680.

The previous prime is 1156168411669. The next prime is 1156168411733. The reversal of 1156168411681 is 1861148616511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1096033111056 + 60135300625 = 1046916^2 + 245225^2 .

It is a cyclic number.

It is not a de Polignac number, because 1156168411681 - 2¹⁵ = 1156168378913 is a prime.

It is a super-2 number, since 2×1156168411681² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1156168411621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 578084205840 + 578084205841.

It is an arithmetic number, because the mean of its divisors is an integer number (578084205841).

Almost surely, 2^{1156168411681} is an apocalyptic number.

It is an amenable number.

1156168411681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1156168411681 is an equidigital number, since it uses as much as digits as its factorization.

1156168411681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 276480, while the sum is 49.

The spelling of 1156168411681 in words is "one trillion, one hundred fifty-six billion, one hundred sixty-eight million, four hundred eleven thousand, six hundred eighty-one".