667212111128 has 16 divisors (see below), whose sum is σ = 1251091632480. Its totient is φ = 333587675808.

The previous prime is 667212111127. The next prime is 667212111143. The reversal of 667212111128 is 821111212766.

667212111128 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 667212111091 and 667212111100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667212111127) 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, 2142575 + ... + 2434142.

It is an arithmetic number, because the mean of its divisors is an integer number (78193227030).

Almost surely, 2^667212111128 is an apocalyptic number.

It is an amenable number.

667212111128 is a deficient number, since it is larger than the sum of its proper divisors (583879521352).

667212111128 is a wasteful number, since it uses less digits than its factorization.

667212111128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4594946 (or 4594942 counting only the distinct ones).

The product of its digits is 16128, while the sum is 38.

The spelling of 667212111128 in words is "six hundred sixty-seven billion, two hundred twelve million, one hundred eleven thousand, one hundred twenty-eight".