667214321568 has 24 divisors (see below), whose sum is σ = 1751437594368. Its totient is φ = 222404773824.

The previous prime is 667214321519. The next prime is 667214321569. The reversal of 667214321568 is 865123412766.

It is a tau number, because it is divible by the number of its divisors (24).

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 667214321568.

It is not an unprimeable number, because it can be changed into a prime (667214321569) 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, 3475074496 + ... + 3475074687.

It is an arithmetic number, because the mean of its divisors is an integer number (72976566432).

Almost surely, 2^667214321568 is an apocalyptic number.

It is an amenable number.

667214321568 is an abundant number, since it is smaller than the sum of its proper divisors (1084223272800).

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

667214321568 is a wasteful number, since it uses less digits than its factorization.

667214321568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6950149196 (or 6950149188 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 51.

The spelling of 667214321568 in words is "six hundred sixty-seven billion, two hundred fourteen million, three hundred twenty-one thousand, five hundred sixty-eight".