1866603010673 has 4 divisors (see below), whose sum is σ = 1866620806260. Its totient is φ = 1866585215088.

The previous prime is 1866603010639. The next prime is 1866603010687. The reversal of 1866603010673 is 3760103066681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 870772655104 + 995830355569 = 933152^2 + 997913^2 .

It is a cyclic number.

It is not a de Polignac number, because 1866603010673 - 2¹⁸ = 1866602748529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1866603010603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8739518 + ... + 8950551.

It is an arithmetic number, because the mean of its divisors is an integer number (466655201565).

Almost surely, 2^{1866603010673} is an apocalyptic number.

It is an amenable number.

1866603010673 is a deficient number, since it is larger than the sum of its proper divisors (17795587).

1866603010673 is a wasteful number, since it uses less digits than its factorization.

1866603010673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17795586.

The product of its (nonzero) digits is 653184, while the sum is 47.

The spelling of 1866603010673 in words is "one trillion, eight hundred sixty-six billion, six hundred three million, ten thousand, six hundred seventy-three".