16664786820 has 144 divisors (see below), whose sum is σ = 56186125632. Its totient is φ = 3963697920.

The previous prime is 16664786819. The next prime is 16664786837. The reversal of 16664786820 is 2868746661.

16664786820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25539 + ... + 184341.

It is an arithmetic number, because the mean of its divisors is an integer number (390181428).

Almost surely, 2^16664786820 is an apocalyptic number.

16664786820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16664786820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28093062816).

16664786820 is an abundant number, since it is smaller than the sum of its proper divisors (39521338812).

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

16664786820 is a wasteful number, since it uses less digits than its factorization.

16664786820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158882 (or 158877 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 54.

The spelling of 16664786820 in words is "sixteen billion, six hundred sixty-four million, seven hundred eighty-six thousand, eight hundred twenty".