1680786678520 has 32 divisors (see below), whose sum is σ = 3782369260800. Its totient is φ = 672208140928.

The previous prime is 1680786678509. The next prime is 1680786678553. The reversal of 1680786678520 is 258766870861.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3073240 + ... + 3578599.

It is an arithmetic number, because the mean of its divisors is an integer number (118199039400).

Almost surely, 2^{1680786678520} is an apocalyptic number.

1680786678520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1680786678520 is an abundant number, since it is smaller than the sum of its proper divisors (2101582582280).

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

1680786678520 is a wasteful number, since it uses less digits than its factorization.

1680786678520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6658167 (or 6658163 counting only the distinct ones).

The product of its (nonzero) digits is 54190080, while the sum is 64.

The spelling of 1680786678520 in words is "one trillion, six hundred eighty billion, seven hundred eighty-six million, six hundred seventy-eight thousand, five hundred twenty".