16680550720 has 28 divisors (see below), whose sum is σ = 39720562164. Its totient is φ = 6672220160.

The previous prime is 16680550717. The next prime is 16680550763. The reversal of 16680550720 is 2705508661.

It can be written as a sum of positive squares in 2 ways, for example, as 10175160384 + 6505390336 = 100872^2 + 80656^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

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 3 ways as a sum of consecutive naturals, for example, 26063041 + ... + 26063680.

Almost surely, 2^16680550720 is an apocalyptic number.

16680550720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16680550720 is an abundant number, since it is smaller than the sum of its proper divisors (23040011444).

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

16680550720 is an equidigital number, since it uses as much as digits as its factorization.

16680550720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52126738 (or 52126728 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 40.

The spelling of 16680550720 in words is "sixteen billion, six hundred eighty million, five hundred fifty thousand, seven hundred twenty".