12912172266 has 128 divisors (see below), whose sum is σ = 32405667840. Its totient is φ = 3346790400.

The previous prime is 12912172261. The next prime is 12912172283. The reversal of 12912172266 is 66227121921.

It is a super-3 number, since 3×12912172266³ (a number of 31 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (12912172261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2396896 + ... + 2402276.

It is an arithmetic number, because the mean of its divisors is an integer number (253169280).

Almost surely, 2^12912172266 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12912172266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16202833920).

12912172266 is an abundant number, since it is smaller than the sum of its proper divisors (19493495574).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12912172266 is a wasteful number, since it uses less digits than its factorization.

12912172266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5540.

The product of its digits is 36288, while the sum is 39.

The spelling of 12912172266 in words is "twelve billion, nine hundred twelve million, one hundred seventy-two thousand, two hundred sixty-six".