18173062081 has 2 divisors, whose sum is σ = 18173062082. Its totient is φ = 18173062080.

The previous prime is 18173062073. The next prime is 18173062087. The reversal of 18173062081 is 18026037181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10589439025 + 7583623056 = 102905^2 + 87084^2 .

It is a cyclic number.

It is not a de Polignac number, because 18173062081 - 2³ = 18173062073 is a prime.

It is a super-2 number, since 2×18173062081² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18173062081.

It is not a weakly prime, because it can be changed into another prime (18173062087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9086531040 + 9086531041.

It is an arithmetic number, because the mean of its divisors is an integer number (9086531041).

Almost surely, 2^18173062081 is an apocalyptic number.

It is an amenable number.

18173062081 is a deficient number, since it is larger than the sum of its proper divisors (1).

18173062081 is an equidigital number, since it uses as much as digits as its factorization.

18173062081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 37.

The spelling of 18173062081 in words is "eighteen billion, one hundred seventy-three million, sixty-two thousand, eighty-one".