220171793789 has 4 divisors (see below), whose sum is σ = 220175861340. Its totient is φ = 220167726240.

The previous prime is 220171793761. The next prime is 220171793833. The reversal of 220171793789 is 987397171022.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28809291289 + 191362502500 = 169733^2 + 437450^2 .

It is a cyclic number.

It is not a de Polignac number, because 220171793789 - 2¹² = 220171789693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220171793389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1951472 + ... + 2061209.

It is an arithmetic number, because the mean of its divisors is an integer number (55043965335).

Almost surely, 2^220171793789 is an apocalyptic number.

It is an amenable number.

220171793789 is a deficient number, since it is larger than the sum of its proper divisors (4067551).

220171793789 is an equidigital number, since it uses as much as digits as its factorization.

220171793789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4067550.

The product of its (nonzero) digits is 2667168, while the sum is 56.

The spelling of 220171793789 in words is "two hundred twenty billion, one hundred seventy-one million, seven hundred ninety-three thousand, seven hundred eighty-nine".