72216321169 has 2 divisors, whose sum is σ = 72216321170. Its totient is φ = 72216321168.

The previous prime is 72216321109. The next prime is 72216321193. The reversal of 72216321169 is 96112361227.

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., 42971217025 + 29245104144 = 207295^2 + 171012^2 .

It is an emirp because it is prime and its reverse (96112361227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72216321169 - 2⁷ = 72216321041 is a prime.

It is a super-2 number, since 2×72216321169² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72216321109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36108160584 + 36108160585.

It is an arithmetic number, because the mean of its divisors is an integer number (36108160585).

Almost surely, 2^72216321169 is an apocalyptic number.

It is an amenable number.

72216321169 is a deficient number, since it is larger than the sum of its proper divisors (1).

72216321169 is an equidigital number, since it uses as much as digits as its factorization.

72216321169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 40.

The spelling of 72216321169 in words is "seventy-two billion, two hundred sixteen million, three hundred twenty-one thousand, one hundred sixty-nine".