18123539069 has 2 divisors, whose sum is σ = 18123539070. Its totient is φ = 18123539068.

The previous prime is 18123539029. The next prime is 18123539089. The reversal of 18123539069 is 96093532181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17764891225 + 358647844 = 133285^2 + 18938^2 .

It is an emirp because it is prime and its reverse (96093532181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18123539069 - 2⁸ = 18123538813 is a prime.

It is a super-2 number, since 2×18123539069² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18123539029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9061769534 + 9061769535.

It is an arithmetic number, because the mean of its divisors is an integer number (9061769535).

Almost surely, 2^18123539069 is an apocalyptic number.

It is an amenable number.

18123539069 is a deficient number, since it is larger than the sum of its proper divisors (1).

18123539069 is an equidigital number, since it uses as much as digits as its factorization.

18123539069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 47.

The spelling of 18123539069 in words is "eighteen billion, one hundred twenty-three million, five hundred thirty-nine thousand, sixty-nine".