18182161841 has 2 divisors, whose sum is σ = 18182161842. Its totient is φ = 18182161840.

The previous prime is 18182161807. The next prime is 18182161859. The reversal of 18182161841 is 14816128181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11522949025 + 6659212816 = 107345^2 + 81604^2 .

It is an emirp because it is prime and its reverse (14816128181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18182161841 - 2³⁴ = 1002292657 is a prime.

It is not a weakly prime, because it can be changed into another prime (18182161241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9091080920 + 9091080921.

It is an arithmetic number, because the mean of its divisors is an integer number (9091080921).

Almost surely, 2^18182161841 is an apocalyptic number.

It is an amenable number.

18182161841 is a deficient number, since it is larger than the sum of its proper divisors (1).

18182161841 is an equidigital number, since it uses as much as digits as its factorization.

18182161841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24576, while the sum is 41.

The spelling of 18182161841 in words is "eighteen billion, one hundred eighty-two million, one hundred sixty-one thousand, eight hundred forty-one".