667212111112 has 16 divisors (see below), whose sum is σ = 1251032951340. Its totient is φ = 333603324096.

The previous prime is 667212111079. The next prime is 667212111113. The reversal of 667212111112 is 211111212766.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 656336541316 + 10875569796 = 810146^2 + 104286^2 .

It is not an unprimeable number, because it can be changed into a prime (667212111113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1012558 + ... + 1536130.

Almost surely, 2^667212111112 is an apocalyptic number.

It is an amenable number.

667212111112 is a deficient number, since it is larger than the sum of its proper divisors (583820840228).

667212111112 is a wasteful number, since it uses less digits than its factorization.

667212111112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 682872 (or 682868 counting only the distinct ones).

The product of its digits is 2016, while the sum is 31.

Adding to 667212111112 its reverse (211111212766), we get a palindrome (878323323878).

The spelling of 667212111112 in words is "six hundred sixty-seven billion, two hundred twelve million, one hundred eleven thousand, one hundred twelve".