1163203616161 has 2 divisors, whose sum is σ = 1163203616162. Its totient is φ = 1163203616160.

The previous prime is 1163203616149. The next prime is 1163203616177. The reversal of 1163203616161 is 1616163023611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1133679785536 + 29523830625 = 1064744^2 + 171825^2 .

It is a cyclic number.

It is not a de Polignac number, because 1163203616161 - 2⁷ = 1163203616033 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1163203616161.

It is not a weakly prime, because it can be changed into another prime (1163203616101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 581601808080 + 581601808081.

It is an arithmetic number, because the mean of its divisors is an integer number (581601808081).

Almost surely, 2^{1163203616161} is an apocalyptic number.

It is an amenable number.

1163203616161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1163203616161 is an equidigital number, since it uses as much as digits as its factorization.

1163203616161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 37.

Adding to 1163203616161 its reverse (1616163023611), we get a palindrome (2779366639772).

The spelling of 1163203616161 in words is "one trillion, one hundred sixty-three billion, two hundred three million, six hundred sixteen thousand, one hundred sixty-one".