12172834903681 has 3 divisors (see below), whose sum is σ = 12172838392641. Its totient is φ = 12172831414722.

The previous prime is 12172834903673. The next prime is 12172834903687. The reversal of 12172834903681 is 18630943827121.

The square root of 12172834903681 is 3488959.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 12172834903681 - 2³ = 12172834903673 is a prime.

It is a super-2 number, since 2×12172834903681² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12172834903687) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1744480 + ... + 5233438.

It is an arithmetic number, because the mean of its divisors is an integer number (4057612797547).

Almost surely, 2^{12172834903681} is an apocalyptic number.

12172834903681 is the 3488959-th square number.

12172834903681 is the 1744480-th centered octagonal number.

It is an amenable number.

12172834903681 is a deficient number, since it is larger than the sum of its proper divisors (3488960).

12172834903681 is an frugal number, since it uses more digits than its factorization.

12172834903681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6977918 (or 3488959 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 55.

The spelling of 12172834903681 in words is "twelve trillion, one hundred seventy-two billion, eight hundred thirty-four million, nine hundred three thousand, six hundred eighty-one".