667667866338 has 128 divisors (see below), whose sum is σ = 1658088161280. Its totient is φ = 197438472000.

The previous prime is 667667866331. The next prime is 667667866343. The reversal of 667667866338 is 833668766766.

It is not an unprimeable number, because it can be changed into a prime (667667866331) 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 63 ways as a sum of consecutive naturals, for example, 4529173 + ... + 4674263.

It is an arithmetic number, because the mean of its divisors is an integer number (12953813760).

Almost surely, 2^667667866338 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 667667866338, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (829044080640).

667667866338 is an abundant number, since it is smaller than the sum of its proper divisors (990420294942).

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

667667866338 is a wasteful number, since it uses less digits than its factorization.

667667866338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145301 (or 145295 counting only the distinct ones).

The product of its digits is 1316818944, while the sum is 72.

The spelling of 667667866338 in words is "six hundred sixty-seven billion, six hundred sixty-seven million, eight hundred sixty-six thousand, three hundred thirty-eight".