667210531812 has 96 divisors (see below), whose sum is σ = 1745303884800. Its totient is φ = 196602318720.

The previous prime is 667210531783. The next prime is 667210531901. The reversal of 667210531812 is 218135012766.

It is a happy number.

667210531812 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 an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8257713 + ... + 8338119.

It is an arithmetic number, because the mean of its divisors is an integer number (18180248800).

Almost surely, 2^667210531812 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 667210531812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (872651942400).

667210531812 is an abundant number, since it is smaller than the sum of its proper divisors (1078093352988).

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

667210531812 is a wasteful number, since it uses less digits than its factorization.

667210531812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82161 (or 82159 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The spelling of 667210531812 in words is "six hundred sixty-seven billion, two hundred ten million, five hundred thirty-one thousand, eight hundred twelve".