18539484169 has 2 divisors, whose sum is σ = 18539484170. Its totient is φ = 18539484168.

The previous prime is 18539484107. The next prime is 18539484209. The reversal of 18539484169 is 96148493581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13273804944 + 5265679225 = 115212^2 + 72565^2 .

It is a cyclic number.

It is not a de Polignac number, because 18539484169 - 2⁹ = 18539483657 is a prime.

It is a super-3 number, since 3×18539484169³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (18539584169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9269742084 + 9269742085.

It is an arithmetic number, because the mean of its divisors is an integer number (9269742085).

Almost surely, 2^18539484169 is an apocalyptic number.

It is an amenable number.

18539484169 is a deficient number, since it is larger than the sum of its proper divisors (1).

18539484169 is an equidigital number, since it uses as much as digits as its factorization.

18539484169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7464960, while the sum is 58.

The spelling of 18539484169 in words is "eighteen billion, five hundred thirty-nine million, four hundred eighty-four thousand, one hundred sixty-nine".