16489923840 has 864 divisors, whose sum is σ = 67469660160. Its totient is φ = 3790209024.

The previous prime is 16489923833. The next prime is 16489923859. The reversal of 16489923840 is 4832998461.

16489923840 is a `hidden beast` number, since 1 + 6 + 489 + 92 + 38 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (864).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 129841857 + ... + 129841983.

Almost surely, 2^16489923840 is an apocalyptic number.

16489923840 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 16489923840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33734830080).

16489923840 is an abundant number, since it is smaller than the sum of its proper divisors (50979736320).

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

16489923840 is a wasteful number, since it uses less digits than its factorization.

16489923840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204 (or 167 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 54.

The spelling of 16489923840 in words is "sixteen billion, four hundred eighty-nine million, nine hundred twenty-three thousand, eight hundred forty".