72218579329 has 16 divisors (see below), whose sum is σ = 78057508032. Its totient is φ = 66420474048.

The previous prime is 72218579269. The next prime is 72218579341. The reversal of 72218579329 is 92397581227.

It is a cyclic number.

It is not a de Polignac number, because 72218579329 - 2³¹ = 70071095681 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72218579329.

It is not an unprimeable number, because it can be changed into a prime (72218579369) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6729562 + ... + 6740284.

It is an arithmetic number, because the mean of its divisors is an integer number (4878594252).

Almost surely, 2^72218579329 is an apocalyptic number.

It is an amenable number.

72218579329 is a deficient number, since it is larger than the sum of its proper divisors (5838928703).

72218579329 is a wasteful number, since it uses less digits than its factorization.

72218579329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12576.

The product of its digits is 3810240, while the sum is 55.

The spelling of 72218579329 in words is "seventy-two billion, two hundred eighteen million, five hundred seventy-nine thousand, three hundred twenty-nine".