18161066177 has 2 divisors, whose sum is σ = 18161066178. Its totient is φ = 18161066176.

The previous prime is 18161066159. The next prime is 18161066243. The reversal of 18161066177 is 77166016181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17978519056 + 182547121 = 134084^2 + 13511^2 .

It is a cyclic number.

It is not a de Polignac number, because 18161066177 - 2¹² = 18161062081 is a prime.

It is not a weakly prime, because it can be changed into another prime (18161069177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9080533088 + 9080533089.

It is an arithmetic number, because the mean of its divisors is an integer number (9080533089).

Almost surely, 2^18161066177 is an apocalyptic number.

It is an amenable number.

18161066177 is a deficient number, since it is larger than the sum of its proper divisors (1).

18161066177 is an equidigital number, since it uses as much as digits as its factorization.

18161066177 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 44.

The spelling of 18161066177 in words is "eighteen billion, one hundred sixty-one million, sixty-six thousand, one hundred seventy-seven".