72722175161 has 2 divisors, whose sum is σ = 72722175162. Its totient is φ = 72722175160.

The previous prime is 72722175151. The next prime is 72722175193. The reversal of 72722175161 is 16157122727.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72522490000 + 199685161 = 269300^2 + 14131^2 .

It is a cyclic number.

It is not a de Polignac number, because 72722175161 - 2¹⁰ = 72722174137 is a prime.

It is not a weakly prime, because it can be changed into another prime (72722175121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36361087580 + 36361087581.

It is an arithmetic number, because the mean of its divisors is an integer number (36361087581).

Almost surely, 2^72722175161 is an apocalyptic number.

It is an amenable number.

72722175161 is a deficient number, since it is larger than the sum of its proper divisors (1).

72722175161 is an equidigital number, since it uses as much as digits as its factorization.

72722175161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82320, while the sum is 41.

Adding to 72722175161 its reverse (16157122727), we get a palindrome (88879297888).

The spelling of 72722175161 in words is "seventy-two billion, seven hundred twenty-two million, one hundred seventy-five thousand, one hundred sixty-one".