667406666668 has 48 divisors (see below), whose sum is σ = 1364430541824. Its totient is φ = 279695750400.

The previous prime is 667406666627. The next prime is 667406666683. The reversal of 667406666668 is 866666604766.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1252068 + ... + 1703668.

It is an arithmetic number, because the mean of its divisors is an integer number (28425636288).

Almost surely, 2^667406666668 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 667406666668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (682215270912).

667406666668 is an abundant number, since it is smaller than the sum of its proper divisors (697023875156).

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

667406666668 is a wasteful number, since it uses less digits than its factorization.

667406666668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452782 (or 452780 counting only the distinct ones).

The product of its (nonzero) digits is 376233984, while the sum is 67.

The spelling of 667406666668 in words is "six hundred sixty-seven billion, four hundred six million, six hundred sixty-six thousand, six hundred sixty-eight".