72222186717 has 6 divisors (see below), whose sum is σ = 104320936382. Its totient is φ = 48148124472.

The previous prime is 72222186713. The next prime is 72222186719. The reversal of 72222186717 is 71768122227.

It can be written as a sum of positive squares in only one way, i.e., 69477579396 + 2744607321 = 263586^2 + 52389^2 .

It is not a de Polignac number, because 72222186717 - 2² = 72222186713 is a prime.

It is a super-2 number, since 2×72222186717² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72222186713) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4012343698 + ... + 4012343715.

Almost surely, 2^72222186717 is an apocalyptic number.

It is an amenable number.

72222186717 is a deficient number, since it is larger than the sum of its proper divisors (32098749665).

72222186717 is a wasteful number, since it uses less digits than its factorization.

72222186717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8024687419 (or 8024687416 counting only the distinct ones).

The product of its digits is 263424, while the sum is 45.

The spelling of 72222186717 in words is "seventy-two billion, two hundred twenty-two million, one hundred eighty-six thousand, seven hundred seventeen".