16680581220 has 48 divisors (see below), whose sum is σ = 49453020288. Its totient is φ = 4186498560.

The previous prime is 16680581209. The next prime is 16680581221. The reversal of 16680581220 is 2218508661.

It is not an unprimeable number, because it can be changed into a prime (16680581221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8175736 + ... + 8177775.

It is an arithmetic number, because the mean of its divisors is an integer number (1030271256).

Almost surely, 2^16680581220 is an apocalyptic number.

16680581220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16680581220 is an abundant number, since it is smaller than the sum of its proper divisors (32772439068).

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

16680581220 is a wasteful number, since it uses less digits than its factorization.

16680581220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16353540 (or 16353538 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 39.

The spelling of 16680581220 in words is "sixteen billion, six hundred eighty million, five hundred eighty-one thousand, two hundred twenty".