18520323605701 has 4 divisors (see below), whose sum is σ = 18684220274892. Its totient is φ = 18356426936512.

The previous prime is 18520323605699. The next prime is 18520323605711. The reversal of 18520323605701 is 10750632302581.

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 524826353601 + 17995497252100 = 724449^2 + 4242110^2 .

It is a cyclic number.

It is not a de Polignac number, because 18520323605701 - 2¹ = 18520323605699 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18520323605711) 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 3 ways as a sum of consecutive naturals, for example, 81948334426 + ... + 81948334651.

It is an arithmetic number, because the mean of its divisors is an integer number (4671055068723).

Almost surely, 2^{18520323605701} is an apocalyptic number.

It is an amenable number.

18520323605701 is a deficient number, since it is larger than the sum of its proper divisors (163896669191).

18520323605701 is a wasteful number, since it uses less digits than its factorization.

18520323605701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163896669190.

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 18520323605701 in words is "eighteen trillion, five hundred twenty billion, three hundred twenty-three million, six hundred five thousand, seven hundred one".