16643939466 has 192 divisors, whose sum is σ = 46403435520. Its totient is φ = 3917168640.

The previous prime is 16643939399. The next prime is 16643939503. The reversal of 16643939466 is 66493934661.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1407370 + ... + 1419146.

It is an arithmetic number, because the mean of its divisors is an integer number (241684560).

Almost surely, 2^16643939466 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16643939466, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23201717760).

16643939466 is an abundant number, since it is smaller than the sum of its proper divisors (29759496054).

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

16643939466 is a wasteful number, since it uses less digits than its factorization.

16643939466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11849 (or 11842 counting only the distinct ones).

The product of its digits is 15116544, while the sum is 57.

The spelling of 16643939466 in words is "sixteen billion, six hundred forty-three million, nine hundred thirty-nine thousand, four hundred sixty-six".