1866814044643 has 16 divisors (see below), whose sum is σ = 1924928603136. Its totient is φ = 1809105325920.

The previous prime is 1866814044619. The next prime is 1866814044679. The reversal of 1866814044643 is 3464404186681.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1866814044643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1866814047643) 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 15 ways as a sum of consecutive naturals, for example, 60929938 + ... + 60960568.

It is an arithmetic number, because the mean of its divisors is an integer number (120308037696).

Almost surely, 2^{1866814044643} is an apocalyptic number.

1866814044643 is a deficient number, since it is larger than the sum of its proper divisors (58114558493).

1866814044643 is a wasteful number, since it uses less digits than its factorization.

1866814044643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37194.

The product of its (nonzero) digits is 10616832, while the sum is 55.

It can be divided in two parts, 186681 and 4044643, that added together give a palindrome (4231324).

The spelling of 1866814044643 in words is "one trillion, eight hundred sixty-six billion, eight hundred fourteen million, forty-four thousand, six hundred forty-three".