667212111144 has 128 divisors (see below), whose sum is σ = 1862151667200. Its totient is φ = 221350993920.

The previous prime is 667212111143. The next prime is 667212111169. The reversal of 667212111144 is 441111212766.

667212111144 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 667212111099 and 667212111108.

It is not an unprimeable number, because it can be changed into a prime (667212111143) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 134978737 + ... + 134983679.

It is an arithmetic number, because the mean of its divisors is an integer number (14548059900).

Almost surely, 2^667212111144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 667212111144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (931075833600).

667212111144 is an abundant number, since it is smaller than the sum of its proper divisors (1194939556056).

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

667212111144 is a wasteful number, since it uses less digits than its factorization.

667212111144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7792 (or 7782 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The spelling of 667212111144 in words is "six hundred sixty-seven billion, two hundred twelve million, one hundred eleven thousand, one hundred forty-four".