16668536668 has 24 divisors (see below), whose sum is σ = 33341149184. Its totient is φ = 7142785200.

The previous prime is 16668536627. The next prime is 16668536789. The reversal of 16668536668 is 86663586661.

It is a happy number.

It is a super-2 number, since 2×16668536668² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231253 + ... + 294643.

Almost surely, 2^16668536668 is an apocalyptic number.

It is an amenable number.

16668536668 is an abundant number, since it is smaller than the sum of its proper divisors (16672612516).

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

16668536668 is a wasteful number, since it uses less digits than its factorization.

16668536668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72793 (or 72791 counting only the distinct ones).

The product of its digits is 44789760, while the sum is 61.

The spelling of 16668536668 in words is "sixteen billion, six hundred sixty-eight million, five hundred thirty-six thousand, six hundred sixty-eight".