1156343315681 has 2 divisors, whose sum is σ = 1156343315682. Its totient is φ = 1156343315680.

The previous prime is 1156343315593. The next prime is 1156343315717. The reversal of 1156343315681 is 1865133436511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1155605650081 + 737665600 = 1074991^2 + 27160^2 .

It is a cyclic number.

It is not a de Polignac number, because 1156343315681 - 2³⁸ = 881465408737 is a prime.

It is a super-2 number, since 2×1156343315681² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1156343345681) 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, 578171657840 + 578171657841.

It is an arithmetic number, because the mean of its divisors is an integer number (578171657841).

Almost surely, 2^{1156343315681} is an apocalyptic number.

It is an amenable number.

1156343315681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1156343315681 is an equidigital number, since it uses as much as digits as its factorization.

1156343315681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 777600, while the sum is 47.

The spelling of 1156343315681 in words is "one trillion, one hundred fifty-six billion, three hundred forty-three million, three hundred fifteen thousand, six hundred eighty-one".