1686478105720 has 32 divisors (see below), whose sum is σ = 3795488928000. Its totient is φ = 674428897408.

The previous prime is 1686478105703. The next prime is 1686478105751. The reversal of 1686478105720 is 275018746861.

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, 4904920 + ... + 5237479.

It is an arithmetic number, because the mean of its divisors is an integer number (118609029000).

Almost surely, 2^{1686478105720} is an apocalyptic number.

1686478105720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1686478105720 is an abundant number, since it is smaller than the sum of its proper divisors (2109010822280).

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

1686478105720 is a wasteful number, since it uses less digits than its factorization.

1686478105720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10146567 (or 10146563 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 55.

The spelling of 1686478105720 in words is "one trillion, six hundred eighty-six billion, four hundred seventy-eight million, one hundred five thousand, seven hundred twenty".