1680020823560 has 16 divisors (see below), whose sum is σ = 3780046853100. Its totient is φ = 672008329408.

The previous prime is 1680020823541. The next prime is 1680020823577. The reversal of 1680020823560 is 653280200861.

It can be written as a sum of positive squares in 2 ways, for example, as 1505141292964 + 174879530596 = 1226842^2 + 418186^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21000260255 + ... + 21000260334.

Almost surely, 2^{1680020823560} is an apocalyptic number.

1680020823560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1680020823560 is an abundant number, since it is smaller than the sum of its proper divisors (2100026029540).

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

1680020823560 is a wasteful number, since it uses less digits than its factorization.

1680020823560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42000520600 (or 42000520596 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 41.

The spelling of 1680020823560 in words is "one trillion, six hundred eighty billion, twenty million, eight hundred twenty-three thousand, five hundred sixty".