16664929668 has 18 divisors (see below), whose sum is σ = 42125238974. Its totient is φ = 5554976544.

The previous prime is 16664929639. The next prime is 16664929669. The reversal of 16664929668 is 86692946661.

It can be written as a sum of positive squares in only one way, i.e., 12012598404 + 4652331264 = 109602^2 + 68208^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (16664929669) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 231457321 + ... + 231457392.

Almost surely, 2^16664929668 is an apocalyptic number.

16664929668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

16664929668 is an abundant number, since it is smaller than the sum of its proper divisors (25460309306).

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

16664929668 is a wasteful number, since it uses less digits than its factorization.

16664929668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462914723 (or 462914718 counting only the distinct ones).

The product of its digits is 40310784, while the sum is 63.

The spelling of 16664929668 in words is "sixteen billion, six hundred sixty-four million, nine hundred twenty-nine thousand, six hundred sixty-eight".