1685764140220 has 12 divisors (see below), whose sum is σ = 3540104694504. Its totient is φ = 674305656080.

The previous prime is 1685764140197. The next prime is 1685764140239. The reversal of 1685764140220 is 220414675861.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42144103486 + ... + 42144103525.

It is an arithmetic number, because the mean of its divisors is an integer number (295008724542).

Almost surely, 2^{1685764140220} is an apocalyptic number.

1685764140220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1685764140220 is an abundant number, since it is smaller than the sum of its proper divisors (1854340554284).

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

1685764140220 is a wasteful number, since it uses less digits than its factorization.

1685764140220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84288207020 (or 84288207018 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 46.

The spelling of 1685764140220 in words is "one trillion, six hundred eighty-five billion, seven hundred sixty-four million, one hundred forty thousand, two hundred twenty".