1685085172812 has 144 divisors (see below), whose sum is σ = 4477670215200. Its totient is φ = 554057625600.

The previous prime is 1685085172807. The next prime is 1685085172829. The reversal of 1685085172812 is 2182715805861.

It is a happy number.

1685085172812 is a `hidden beast` number, since 1 + 6 + 8 + 508 + 51 + 7 + 2 + 81 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 47 ways as a sum of consecutive naturals, for example, 26376364 + ... + 26440172.

It is an arithmetic number, because the mean of its divisors is an integer number (31094932050).

Almost surely, 2^{1685085172812} is an apocalyptic number.

1685085172812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1685085172812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2238835107600).

1685085172812 is an abundant number, since it is smaller than the sum of its proper divisors (2792585042388).

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

1685085172812 is a wasteful number, since it uses less digits than its factorization.

1685085172812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64198 (or 64184 counting only the distinct ones).

The product of its (nonzero) digits is 2150400, while the sum is 54.

The spelling of 1685085172812 in words is "one trillion, six hundred eighty-five billion, eighty-five million, one hundred seventy-two thousand, eight hundred twelve".