18389487161 has 2 divisors, whose sum is σ = 18389487162. Its totient is φ = 18389487160.

The previous prime is 18389487059. The next prime is 18389487167. The reversal of 18389487161 is 16178498381.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13787221561 + 4602265600 = 117419^2 + 67840^2 .

It is a cyclic number.

It is not a de Polignac number, because 18389487161 - 2²⁶ = 18322378297 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18389487097 and 18389487106.

It is not a weakly prime, because it can be changed into another prime (18389487167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9194743580 + 9194743581.

It is an arithmetic number, because the mean of its divisors is an integer number (9194743581).

Almost surely, 2^18389487161 is an apocalyptic number.

It is an amenable number.

18389487161 is a deficient number, since it is larger than the sum of its proper divisors (1).

18389487161 is an equidigital number, since it uses as much as digits as its factorization.

18389487161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2322432, while the sum is 56.

The spelling of 18389487161 in words is "eighteen billion, three hundred eighty-nine million, four hundred eighty-seven thousand, one hundred sixty-one".