2188221078617 has 6 divisors (see below), whose sum is σ = 2545481662938. Its totient is φ = 1875618067344.

The previous prime is 2188221078613. The next prime is 2188221078649. The reversal of 2188221078617 is 7168701228812.

It can be written as a sum of positive squares in only one way, i.e., 1317454022416 + 870767056201 = 1147804^2 + 933149^2 .

It is not a de Polignac number, because 2188221078617 - 2² = 2188221078613 is a prime.

It is a super-3 number, since 3×2188221078617³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2188221078611) 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, 22328786468 + ... + 22328786565.

It is an arithmetic number, because the mean of its divisors is an integer number (424246943823).

Almost surely, 2^{2188221078617} is an apocalyptic number.

It is an amenable number.

2188221078617 is a deficient number, since it is larger than the sum of its proper divisors (357260584321).

2188221078617 is an equidigital number, since it uses as much as digits as its factorization.

2188221078617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44657573047 (or 44657573040 counting only the distinct ones).

The product of its (nonzero) digits is 1204224, while the sum is 53.

The spelling of 2188221078617 in words is "two trillion, one hundred eighty-eight billion, two hundred twenty-one million, seventy-eight thousand, six hundred seventeen".