18287519129161 has 2 divisors, whose sum is σ = 18287519129162. Its totient is φ = 18287519129160.

The previous prime is 18287519129153. The next prime is 18287519129227. The reversal of 18287519129161 is 16192191578281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15818438017600 + 2469081111561 = 3977240^2 + 1571331^2 .

It is a cyclic number.

It is not a de Polignac number, because 18287519129161 - 2³ = 18287519129153 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18287519129161.

It is not a weakly prime, because it can be changed into another prime (18287519129261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9143759564580 + 9143759564581.

It is an arithmetic number, because the mean of its divisors is an integer number (9143759564581).

Almost surely, 2^{18287519129161} is an apocalyptic number.

It is an amenable number.

18287519129161 is a deficient number, since it is larger than the sum of its proper divisors (1).

18287519129161 is an equidigital number, since it uses as much as digits as its factorization.

18287519129161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 61.

The spelling of 18287519129161 in words is "eighteen trillion, two hundred eighty-seven billion, five hundred nineteen million, one hundred twenty-nine thousand, one hundred sixty-one".