18028265161 has 2 divisors, whose sum is σ = 18028265162. Its totient is φ = 18028265160.

The previous prime is 18028265147. The next prime is 18028265173. The reversal of 18028265161 is 16156282081.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16063027600 + 1965237561 = 126740^2 + 44331^2 .

It is a cyclic number.

It is not a de Polignac number, because 18028265161 - 2²⁷ = 17894047433 is a prime.

It is not a weakly prime, because it can be changed into another prime (18028265131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9014132580 + 9014132581.

It is an arithmetic number, because the mean of its divisors is an integer number (9014132581).

Almost surely, 2^18028265161 is an apocalyptic number.

It is an amenable number.

18028265161 is a deficient number, since it is larger than the sum of its proper divisors (1).

18028265161 is an equidigital number, since it uses as much as digits as its factorization.

18028265161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46080, while the sum is 40.

The spelling of 18028265161 in words is "eighteen billion, twenty-eight million, two hundred sixty-five thousand, one hundred sixty-one".