667646845724 has 12 divisors (see below), whose sum is σ = 1168449509304. Its totient is φ = 333804128784.

The previous prime is 667646845703. The next prime is 667646845727. The reversal of 667646845724 is 427548646766.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667646845727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4745522 + ... + 4884185.

It is an arithmetic number, because the mean of its divisors is an integer number (97370792442).

Almost surely, 2^667646845724 is an apocalyptic number.

It is an amenable number.

667646845724 is a deficient number, since it is larger than the sum of its proper divisors (500802663580).

667646845724 is a wasteful number, since it uses less digits than its factorization.

667646845724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9647044 (or 9647042 counting only the distinct ones).

The product of its digits is 325140480, while the sum is 65.

The spelling of 667646845724 in words is "six hundred sixty-seven billion, six hundred forty-six million, eight hundred forty-five thousand, seven hundred twenty-four".