16605220320 has 672 divisors, whose sum is σ = 64967640192. Its totient is φ = 3983302656.

The previous prime is 16605220267. The next prime is 16605220337. The reversal of 16605220320 is 2302250661.

16605220320 is a `hidden beast` number, since 1 + 6 + 605 + 2 + 20 + 32 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 71266924 + ... + 71267156.

It is an arithmetic number, because the mean of its divisors is an integer number (96678036).

Almost surely, 2^16605220320 is an apocalyptic number.

16605220320 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 16605220320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32483820096).

16605220320 is an abundant number, since it is smaller than the sum of its proper divisors (48362419872).

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

16605220320 is a wasteful number, since it uses less digits than its factorization.

16605220320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326 (or 303 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 16605220320 its reverse (2302250661), we get a palindrome (18907470981).

The spelling of 16605220320 in words is "sixteen billion, six hundred five million, two hundred twenty thousand, three hundred twenty".