73221018161 has 2 divisors, whose sum is σ = 73221018162. Its totient is φ = 73221018160.

The previous prime is 73221018133. The next prime is 73221018173. The reversal of 73221018161 is 16181012237.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37289541025 + 35931477136 = 193105^2 + 189556^2 .

It is a cyclic number.

It is not a de Polignac number, because 73221018161 - 2³⁰ = 72147276337 is a prime.

It is a super-2 number, since 2×73221018161² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (73221038161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36610509080 + 36610509081.

It is an arithmetic number, because the mean of its divisors is an integer number (36610509081).

Almost surely, 2^73221018161 is an apocalyptic number.

It is an amenable number.

73221018161 is a deficient number, since it is larger than the sum of its proper divisors (1).

73221018161 is an equidigital number, since it uses as much as digits as its factorization.

73221018161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 32.

The spelling of 73221018161 in words is "seventy-three billion, two hundred twenty-one million, eighteen thousand, one hundred sixty-one".