1685921112020 has 48 divisors (see below), whose sum is σ = 3657140072208. Its totient is φ = 652349491200.

The previous prime is 1685921111939. The next prime is 1685921112047. The reversal of 1685921112020 is 202111295861.

It can be written as a sum of positive squares in 8 ways, for example, as 496852994884 + 1189068117136 = 704878^2 + 1090444^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6456581 + ... + 6712620.

It is an arithmetic number, because the mean of its divisors is an integer number (76190418171).

Almost surely, 2^{1685921112020} is an apocalyptic number.

1685921112020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1685921112020 is an abundant number, since it is smaller than the sum of its proper divisors (1971218960188).

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

1685921112020 is a wasteful number, since it uses less digits than its factorization.

1685921112020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13169420 (or 13169418 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 38.

The spelling of 1685921112020 in words is "one trillion, six hundred eighty-five billion, nine hundred twenty-one million, one hundred twelve thousand, twenty".