18169172789 has 2 divisors, whose sum is σ = 18169172790. Its totient is φ = 18169172788.

The previous prime is 18169172737. The next prime is 18169172797. The reversal of 18169172789 is 98727196181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12486274564 + 5682898225 = 111742^2 + 75385^2 .

It is a cyclic number.

It is not a de Polignac number, because 18169172789 - 2³² = 13874205493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18169172719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9084586394 + 9084586395.

It is an arithmetic number, because the mean of its divisors is an integer number (9084586395).

Almost surely, 2^18169172789 is an apocalyptic number.

It is an amenable number.

18169172789 is a deficient number, since it is larger than the sum of its proper divisors (1).

18169172789 is an equidigital number, since it uses as much as digits as its factorization.

18169172789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3048192, while the sum is 59.

The spelling of 18169172789 in words is "eighteen billion, one hundred sixty-nine million, one hundred seventy-two thousand, seven hundred eighty-nine".