18192728161 has 2 divisors, whose sum is σ = 18192728162. Its totient is φ = 18192728160.

The previous prime is 18192728129. The next prime is 18192728227. The reversal of 18192728161 is 16182729181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17565526225 + 627201936 = 132535^2 + 25044^2 .

It is a cyclic number.

It is not a de Polignac number, because 18192728161 - 2⁵ = 18192728129 is a prime.

It is not a weakly prime, because it can be changed into another prime (18192723161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9096364080 + 9096364081.

It is an arithmetic number, because the mean of its divisors is an integer number (9096364081).

Almost surely, 2^18192728161 is an apocalyptic number.

It is an amenable number.

18192728161 is a deficient number, since it is larger than the sum of its proper divisors (1).

18192728161 is an equidigital number, since it uses as much as digits as its factorization.

18192728161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 46.

The spelling of 18192728161 in words is "eighteen billion, one hundred ninety-two million, seven hundred twenty-eight thousand, one hundred sixty-one".