5533381818161 has 2 divisors, whose sum is σ = 5533381818162. Its totient is φ = 5533381818160.

The previous prime is 5533381818157. The next prime is 5533381818337. The reversal of 5533381818161 is 1618181833355.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5085092650225 + 448289167936 = 2255015^2 + 669544^2 .

It is a cyclic number.

It is not a de Polignac number, because 5533381818161 - 2² = 5533381818157 is a prime.

It is not a weakly prime, because it can be changed into another prime (5533381818101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2766690909080 + 2766690909081.

It is an arithmetic number, because the mean of its divisors is an integer number (2766690909081).

Almost surely, 2^{5533381818161} is an apocalyptic number.

It is an amenable number.

5533381818161 is a deficient number, since it is larger than the sum of its proper divisors (1).

5533381818161 is an equidigital number, since it uses as much as digits as its factorization.

5533381818161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2073600, while the sum is 53.

The spelling of 5533381818161 in words is "five trillion, five hundred thirty-three billion, three hundred eighty-one million, eight hundred eighteen thousand, one hundred sixty-one".