1681858169766 has 96 divisors (see below), whose sum is σ = 3846685939200. Its totient is φ = 530548021440.

The previous prime is 1681858169749. The next prime is 1681858169767. The reversal of 1681858169766 is 6679618581861.

It is a junction number, because it is equal to n+sod(n) for n = 1681858169694 and 1681858169703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681858169767) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2768565 + ... + 3320943.

It is an arithmetic number, because the mean of its divisors is an integer number (40069645200).

Almost surely, 2^{1681858169766} is an apocalyptic number.

1681858169766 is an abundant number, since it is smaller than the sum of its proper divisors (2164827769434).

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

1681858169766 is a wasteful number, since it uses less digits than its factorization.

1681858169766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552554 (or 552551 counting only the distinct ones).

The product of its digits is 209018880, while the sum is 72.

The spelling of 1681858169766 in words is "one trillion, six hundred eighty-one billion, eight hundred fifty-eight million, one hundred sixty-nine thousand, seven hundred sixty-six".