668888235168 has 24 divisors (see below), whose sum is σ = 1755831617568. Its totient is φ = 222962745024.

The previous prime is 668888235151. The next prime is 668888235199. The reversal of 668888235168 is 861532888866.

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

It is a super-2 number, since 2×668888235168² (a number of 24 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (69) coincides with the sum of the digits of its distinct prime factors.

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, 3483792796 + ... + 3483792987.

It is an arithmetic number, because the mean of its divisors is an integer number (73159650732).

Almost surely, 2^668888235168 is an apocalyptic number.

It is an amenable number.

668888235168 is an abundant number, since it is smaller than the sum of its proper divisors (1086943382400).

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

668888235168 is a wasteful number, since it uses less digits than its factorization.

668888235168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6967585796 (or 6967585788 counting only the distinct ones).

The product of its digits is 212336640, while the sum is 69.

The spelling of 668888235168 in words is "six hundred sixty-eight billion, eight hundred eighty-eight million, two hundred thirty-five thousand, one hundred sixty-eight".