18065641436509 has 2 divisors, whose sum is σ = 18065641436510. Its totient is φ = 18065641436508.

The previous prime is 18065641436483. The next prime is 18065641436573. The reversal of 18065641436509 is 90563414656081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16821457351609 + 1244184084900 = 4101397^2 + 1115430^2 .

It is an emirp because it is prime and its reverse (90563414656081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18065641436509 - 2³³ = 18057051501917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18065641436599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9032820718254 + 9032820718255.

It is an arithmetic number, because the mean of its divisors is an integer number (9032820718255).

Almost surely, 2^{18065641436509} is an apocalyptic number.

It is an amenable number.

18065641436509 is a deficient number, since it is larger than the sum of its proper divisors (1).

18065641436509 is an equidigital number, since it uses as much as digits as its factorization.

18065641436509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18662400, while the sum is 58.

The spelling of 18065641436509 in words is "eighteen trillion, sixty-five billion, six hundred forty-one million, four hundred thirty-six thousand, five hundred nine".