16680211920 has 120 divisors (see below), whose sum is σ = 56041241256. Its totient is φ = 4446188544.

The previous prime is 16680211901. The next prime is 16680211931. The reversal of 16680211920 is 2911208661.

It can be written as a sum of positive squares in 4 ways, for example, as 2039184 + 16678172736 = 1428^2 + 129144^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×16680211920² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2990254 + ... + 2995826.

Almost surely, 2^16680211920 is an apocalyptic number.

16680211920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16680211920 is an abundant number, since it is smaller than the sum of its proper divisors (39361029336).

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

16680211920 is a wasteful number, since it uses less digits than its factorization.

16680211920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9749 (or 9740 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The spelling of 16680211920 in words is "sixteen billion, six hundred eighty million, two hundred eleven thousand, nine hundred twenty".