18654563973 has 4 divisors (see below), whose sum is σ = 24872751968. Its totient is φ = 12436375980.

The previous prime is 18654563957. The next prime is 18654564007. The reversal of 18654563973 is 37936545681.

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 not a de Polignac number, because 18654563973 - 2⁴ = 18654563957 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 (18654562973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3109093993 + ... + 3109093998.

It is an arithmetic number, because the mean of its divisors is an integer number (6218187992).

Almost surely, 2^18654563973 is an apocalyptic number.

It is an amenable number.

18654563973 is a deficient number, since it is larger than the sum of its proper divisors (6218187995).

18654563973 is an equidigital number, since it uses as much as digits as its factorization.

18654563973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6218187994.

The product of its digits is 16329600, while the sum is 57.

The spelling of 18654563973 in words is "eighteen billion, six hundred fifty-four million, five hundred sixty-three thousand, nine hundred seventy-three".