18730409189 has 2 divisors, whose sum is σ = 18730409190. Its totient is φ = 18730409188.

The previous prime is 18730409167. The next prime is 18730409197. The reversal of 18730409189 is 98190403781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18730112164 + 297025 = 136858^2 + 545^2 .

It is a cyclic number.

It is not a de Polignac number, because 18730409189 - 2¹² = 18730405093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18730409149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9365204594 + 9365204595.

It is an arithmetic number, because the mean of its divisors is an integer number (9365204595).

Almost surely, 2^18730409189 is an apocalyptic number.

It is an amenable number.

18730409189 is a deficient number, since it is larger than the sum of its proper divisors (1).

18730409189 is an equidigital number, since it uses as much as digits as its factorization.

18730409189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 50.

The spelling of 18730409189 in words is "eighteen billion, seven hundred thirty million, four hundred nine thousand, one hundred eighty-nine".