1866481680843 has 48 divisors (see below), whose sum is σ = 2913809633280. Its totient is φ = 1144495051200.

The previous prime is 1866481680829. The next prime is 1866481680851. The reversal of 1866481680843 is 3480861846681.

1866481680843 is a `hidden beast` number, since 18 + 6 + 6 + 481 + 68 + 0 + 84 + 3 = 666.

It is not a de Polignac number, because 1866481680843 - 2¹⁷ = 1866481549771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1866481680863) 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, 122216298 + ... + 122231568.

It is an arithmetic number, because the mean of its divisors is an integer number (60704367360).

Almost surely, 2^{1866481680843} is an apocalyptic number.

1866481680843 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1866481680843 is a deficient number, since it is larger than the sum of its proper divisors (1047327952437).

1866481680843 is a wasteful number, since it uses less digits than its factorization.

1866481680843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18960 (or 18957 counting only the distinct ones).

The product of its (nonzero) digits is 42467328, while the sum is 63.

The spelling of 1866481680843 in words is "one trillion, eight hundred sixty-six billion, four hundred eighty-one million, six hundred eighty thousand, eight hundred forty-three".