18803507573 has 4 divisors (see below), whose sum is σ = 18881530668. Its totient is φ = 18725484480.

The previous prime is 18803507551. The next prime is 18803507581. The reversal of 18803507573 is 37570530881.

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 5947802884 + 12855704689 = 77122^2 + 113383^2 .

It is a cyclic number.

It is not a de Polignac number, because 18803507573 - 2¹⁸ = 18803245429 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 (18803507273) 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, 39011186 + ... + 39011667.

It is an arithmetic number, because the mean of its divisors is an integer number (4720382667).

Almost surely, 2^18803507573 is an apocalyptic number.

It is an amenable number.

18803507573 is a deficient number, since it is larger than the sum of its proper divisors (78023095).

18803507573 is an equidigital number, since it uses as much as digits as its factorization.

18803507573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78023094.

The product of its (nonzero) digits is 705600, while the sum is 47.

The spelling of 18803507573 in words is "eighteen billion, eight hundred three million, five hundred seven thousand, five hundred seventy-three".