1866867686682 has 48 divisors (see below), whose sum is σ = 3835700829792. Its totient is φ = 605684418400.

The previous prime is 1866867686657. The next prime is 1866867686687. The reversal of 1866867686682 is 2866867686681.

It is a junction number, because it is equal to n+sod(n) for n = 1866867686598 and 1866867686607.

It is not an unprimeable number, because it can be changed into a prime (1866867686687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1666993 + ... + 2551979.

It is an arithmetic number, because the mean of its divisors is an integer number (79910433954).

Almost surely, 2^{1866867686682} is an apocalyptic number.

1866867686682 is an abundant number, since it is smaller than the sum of its proper divisors (1968833143110).

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

1866867686682 is a wasteful number, since it uses less digits than its factorization.

1866867686682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885211 (or 885152 counting only the distinct ones).

The product of its digits is 2675441664, while the sum is 78.

Subtracting 1866867686682 from its reverse (2866867686681), we obtain a palindrome (999999999999).

The spelling of 1866867686682 in words is "one trillion, eight hundred sixty-six billion, eight hundred sixty-seven million, six hundred eighty-six thousand, six hundred eighty-two".