16663381020 has 384 divisors, whose sum is σ = 62878556160. Its totient is φ = 3608064000.

The previous prime is 16663381019. The next prime is 16663381057. The reversal of 16663381020 is 2018336661.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2390340 + ... + 2397300.

It is an arithmetic number, because the mean of its divisors is an integer number (163746240).

Almost surely, 2^16663381020 is an apocalyptic number.

16663381020 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 16663381020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31439278080).

16663381020 is an abundant number, since it is smaller than the sum of its proper divisors (46215175140).

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

16663381020 is a wasteful number, since it uses less digits than its factorization.

16663381020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7034 (or 7026 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The spelling of 16663381020 in words is "sixteen billion, six hundred sixty-three million, three hundred eighty-one thousand, twenty".