18050005081 has 2 divisors, whose sum is σ = 18050005082. Its totient is φ = 18050005080.

The previous prime is 18050005069. The next prime is 18050005091.

18050005081 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10600761600 + 7449243481 = 102960^2 + 86309^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 18050005081 - 2⁹ = 18050004569 is a prime.

It is a super-2 number, since 2×18050005081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18050005031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9025002540 + 9025002541.

It is an arithmetic number, because the mean of its divisors is an integer number (9025002541).

Almost surely, 2^18050005081 is an apocalyptic number.

It is an amenable number.

18050005081 is a deficient number, since it is larger than the sum of its proper divisors (1).

18050005081 is an equidigital number, since it uses as much as digits as its factorization.

18050005081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1600, while the sum is 28.

The spelling of 18050005081 in words is "eighteen billion, fifty million, five thousand, eighty-one".