72223605217 has 2 divisors, whose sum is σ = 72223605218. Its totient is φ = 72223605216.

The previous prime is 72223605199. The next prime is 72223605271. The reversal of 72223605217 is 71250632227.

Together with next prime (72223605271) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65088255376 + 7135349841 = 255124^2 + 84471^2 .

It is a cyclic number.

It is not a de Polignac number, because 72223605217 - 2¹¹ = 72223603169 is a prime.

It is not a weakly prime, because it can be changed into another prime (72223605017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36111802608 + 36111802609.

It is an arithmetic number, because the mean of its divisors is an integer number (36111802609).

Almost surely, 2^72223605217 is an apocalyptic number.

It is an amenable number.

72223605217 is a deficient number, since it is larger than the sum of its proper divisors (1).

72223605217 is an equidigital number, since it uses as much as digits as its factorization.

72223605217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 37.

The spelling of 72223605217 in words is "seventy-two billion, two hundred twenty-three million, six hundred five thousand, two hundred seventeen".