667334806668 has 36 divisors (see below), whose sum is σ = 1688797634160. Its totient is φ = 222191282016.

The previous prime is 667334806661. The next prime is 667334806669. The reversal of 667334806668 is 866608433766.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (667334806661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10536888 + ... + 10600031.

Almost surely, 2^667334806668 is an apocalyptic number.

It is an amenable number.

667334806668 is an abundant number, since it is smaller than the sum of its proper divisors (1021462827492).

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

667334806668 is a wasteful number, since it uses less digits than its factorization.

667334806668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21137806 (or 21137801 counting only the distinct ones).

The product of its (nonzero) digits is 125411328, while the sum is 63.

The spelling of 667334806668 in words is "six hundred sixty-seven billion, three hundred thirty-four million, eight hundred six thousand, six hundred sixty-eight".