667722031947568 has 20 divisors (see below), whose sum is σ = 1393227701275648. Its totient is φ = 308179399360320.

The previous prime is 667722031947463. The next prime is 667722031947587. The reversal of 667722031947568 is 865749130227766.

667722031947568 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×667722031947568² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 667722031947568.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1605101038128 + ... + 1605101038543.

It is a 1-persistent number, because it is pandigital, but 2⋅667722031947568 = 1335444063895136 is not.

Almost surely, 2^{667722031947568} is an apocalyptic number.

It is an amenable number.

667722031947568 is an abundant number, since it is smaller than the sum of its proper divisors (725505669328080).

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

667722031947568 is a wasteful number, since it uses less digits than its factorization.

667722031947568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3210202076692 (or 3210202076686 counting only the distinct ones).

The product of its (nonzero) digits is 1280240640, while the sum is 73.

The spelling of 667722031947568 in words is "six hundred sixty-seven trillion, seven hundred twenty-two billion, thirty-one million, nine hundred forty-seven thousand, five hundred sixty-eight".