18804637973 has 4 divisors (see below), whose sum is σ = 20514150528. Its totient is φ = 17095125420.

The previous prime is 18804637931. The next prime is 18804637981. The reversal of 18804637973 is 37973640881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18804637973 - 2⁸ = 18804637717 is a prime.

It is a super-2 number, since 2×18804637973² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18804637993) 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, 854756261 + ... + 854756282.

It is an arithmetic number, because the mean of its divisors is an integer number (5128537632).

Almost surely, 2^18804637973 is an apocalyptic number.

It is an amenable number.

18804637973 is a deficient number, since it is larger than the sum of its proper divisors (1709512555).

18804637973 is a wasteful number, since it uses less digits than its factorization.

18804637973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1709512554.

The product of its (nonzero) digits is 6096384, while the sum is 56.

The spelling of 18804637973 in words is "eighteen billion, eight hundred four million, six hundred thirty-seven thousand, nine hundred seventy-three".