1806520320001 has 4 divisors (see below), whose sum is σ = 1807200232452. Its totient is φ = 1805840407552.

The previous prime is 1806520319983. The next prime is 1806520320013. The reversal of 1806520320001 is 1000230256081.

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 1140248094976 + 666272225025 = 1067824^2 + 816255^2 .

It is a cyclic number.

It is not a de Polignac number, because 1806520320001 - 2⁹ = 1806520319489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1806520320041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 339952240 + ... + 339957553.

It is an arithmetic number, because the mean of its divisors is an integer number (451800058113).

Almost surely, 2^{1806520320001} is an apocalyptic number.

It is an amenable number.

1806520320001 is a deficient number, since it is larger than the sum of its proper divisors (679912451).

1806520320001 is an equidigital number, since it uses as much as digits as its factorization.

1806520320001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679912450.

The product of its (nonzero) digits is 2880, while the sum is 28.

Adding to 1806520320001 its reverse (1000230256081), we get a palindrome (2806750576082).

The spelling of 1806520320001 in words is "one trillion, eight hundred six billion, five hundred twenty million, three hundred twenty thousand, one".