16399328000 has 144 divisors (see below), whose sum is σ = 44567621280. Its totient is φ = 5963264000.

The previous prime is 16399327991. The next prime is 16399328027. The reversal of 16399328000 is 82399361.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 328706 + ... + 375294.

It is an arithmetic number, because the mean of its divisors is an integer number (309497370).

Almost surely, 2^16399328000 is an apocalyptic number.

16399328000 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 16399328000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22283810640).

16399328000 is an abundant number, since it is smaller than the sum of its proper divisors (28168293280).

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

16399328000 is an equidigital number, since it uses as much as digits as its factorization.

16399328000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46631 (or 46607 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 41.

The spelling of 16399328000 in words is "sixteen billion, three hundred ninety-nine million, three hundred twenty-eight thousand".