72191222689 has 16 divisors (see below), whose sum is σ = 76554261504. Its totient is φ = 67965004800.

The previous prime is 72191222669. The next prime is 72191222717. The reversal of 72191222689 is 98622219127.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 72191222689 - 2⁵ = 72191222657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72191222659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 368212 + ... + 529114.

It is an arithmetic number, because the mean of its divisors is an integer number (4784641344).

Almost surely, 2^72191222689 is an apocalyptic number.

It is an amenable number.

72191222689 is a deficient number, since it is larger than the sum of its proper divisors (4363038815).

72191222689 is a wasteful number, since it uses less digits than its factorization.

72191222689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161328.

The product of its digits is 435456, while the sum is 49.

The spelling of 72191222689 in words is "seventy-two billion, one hundred ninety-one million, two hundred twenty-two thousand, six hundred eighty-nine".