18418961590129 has 2 divisors, whose sum is σ = 18418961590130. Its totient is φ = 18418961590128.

The previous prime is 18418961590091. The next prime is 18418961590171. The reversal of 18418961590129 is 92109516981481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17109143142400 + 1309818447729 = 4136320^2 + 1144473^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18418961590129 is a prime.

It is not a weakly prime, because it can be changed into another prime (18418961590829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9209480795064 + 9209480795065.

It is an arithmetic number, because the mean of its divisors is an integer number (9209480795065).

Almost surely, 2^{18418961590129} is an apocalyptic number.

It is an amenable number.

18418961590129 is a deficient number, since it is larger than the sum of its proper divisors (1).

18418961590129 is an equidigital number, since it uses as much as digits as its factorization.

18418961590129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11197440, while the sum is 64.

The spelling of 18418961590129 in words is "eighteen trillion, four hundred eighteen billion, nine hundred sixty-one million, five hundred ninety thousand, one hundred twenty-nine".