18473156161 has 2 divisors, whose sum is σ = 18473156162. Its totient is φ = 18473156160.

The previous prime is 18473156113. The next prime is 18473156171. The reversal of 18473156161 is 16165137481.

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., 15139825936 + 3333330225 = 123044^2 + 57735^2 .

It is a cyclic number.

It is not a de Polignac number, because 18473156161 - 2⁷ = 18473156033 is a prime.

It is not a weakly prime, because it can be changed into another prime (18473156171) 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, 9236578080 + 9236578081.

It is an arithmetic number, because the mean of its divisors is an integer number (9236578081).

Almost surely, 2^18473156161 is an apocalyptic number.

It is an amenable number.

18473156161 is a deficient number, since it is larger than the sum of its proper divisors (1).

18473156161 is an equidigital number, since it uses as much as digits as its factorization.

18473156161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 43.

The spelling of 18473156161 in words is "eighteen billion, four hundred seventy-three million, one hundred fifty-six thousand, one hundred sixty-one".