667317056 has 56 divisors (see below), whose sum is σ = 1527633216. Its totient is φ = 283299840.

The previous prime is 667317047. The next prime is 667317059. The reversal of 667317056 is 650713766.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667317059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40976 + ... + 54896.

Almost surely, 2^667317056 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 667317056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (763816608).

667317056 is an abundant number, since it is smaller than the sum of its proper divisors (860316160).

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

667317056 is a wasteful number, since it uses less digits than its factorization.

667317056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14047 (or 14037 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 41.

The square root of 667317056 is about 25832.4806396908. The cubic root of 667317056 is about 873.8644561119.

The spelling of 667317056 in words is "six hundred sixty-seven million, three hundred seventeen thousand, fifty-six".