72158521163 has 2 divisors, whose sum is σ = 72158521164. Its totient is φ = 72158521162.

The previous prime is 72158521153. The next prime is 72158521177. The reversal of 72158521163 is 36112585127.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (36112585127) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72158521163 is a prime.

It is a super-2 number, since 2×72158521163² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 72158521163.

It is not a weakly prime, because it can be changed into another prime (72158521133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36079260581 + 36079260582.

It is an arithmetic number, because the mean of its divisors is an integer number (36079260582).

Almost surely, 2^72158521163 is an apocalyptic number.

72158521163 is a deficient number, since it is larger than the sum of its proper divisors (1).

72158521163 is an equidigital number, since it uses as much as digits as its factorization.

72158521163 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100800, while the sum is 41.

The spelling of 72158521163 in words is "seventy-two billion, one hundred fifty-eight million, five hundred twenty-one thousand, one hundred sixty-three".