1806559018051 has 4 divisors (see below), whose sum is σ = 1824445741104. Its totient is φ = 1788672295000.

The previous prime is 1806559018031. The next prime is 1806559018063. The reversal of 1806559018051 is 1508109556081.

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

It is a cyclic number.

It is not a de Polignac number, because 1806559018051 - 2³¹ = 1804411534403 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1806559017986 and 1806559018004.

It is not an unprimeable number, because it can be changed into a prime (1806559018031) 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 3 ways as a sum of consecutive naturals, for example, 8943361375 + ... + 8943361576.

It is an arithmetic number, because the mean of its divisors is an integer number (456111435276).

Almost surely, 2^{1806559018051} is an apocalyptic number.

1806559018051 is a deficient number, since it is larger than the sum of its proper divisors (17886723053).

1806559018051 is a wasteful number, since it uses less digits than its factorization.

1806559018051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17886723052.

The product of its (nonzero) digits is 432000, while the sum is 49.

The spelling of 1806559018051 in words is "one trillion, eight hundred six billion, five hundred fifty-nine million, eighteen thousand, fifty-one".