1866105118999 has 16 divisors (see below), whose sum is σ = 2062963437696. Its totient is φ = 1673908540000.

The previous prime is 1866105118987. The next prime is 1866105119023. The reversal of 1866105118999 is 9998115016681.

It is a cyclic number.

It is not a de Polignac number, because 1866105118999 - 2⁹ = 1866105118487 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1866105118999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866105115999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2862892 + ... + 3453745.

It is an arithmetic number, because the mean of its divisors is an integer number (128935214856).

Almost surely, 2^{1866105118999} is an apocalyptic number.

1866105118999 is a deficient number, since it is larger than the sum of its proper divisors (196858318697).

1866105118999 is a wasteful number, since it uses less digits than its factorization.

1866105118999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6317006.

The product of its (nonzero) digits is 8398080, while the sum is 64.

The spelling of 1866105118999 in words is "one trillion, eight hundred sixty-six billion, one hundred five million, one hundred eighteen thousand, nine hundred ninety-nine".