18819329503 has 4 divisors (see below), whose sum is σ = 20266970248. Its totient is φ = 17371688760.

The previous prime is 18819329497. The next prime is 18819329521. The reversal of 18819329503 is 30592391881.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18819329503 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 (18819329003) 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, 723820353 + ... + 723820378.

It is an arithmetic number, because the mean of its divisors is an integer number (5066742562).

Almost surely, 2^18819329503 is an apocalyptic number.

18819329503 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18819329503 is a deficient number, since it is larger than the sum of its proper divisors (1447640745).

18819329503 is a wasteful number, since it uses less digits than its factorization.

18819329503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1447640744.

The product of its (nonzero) digits is 466560, while the sum is 49.

The spelling of 18819329503 in words is "eighteen billion, eight hundred nineteen million, three hundred twenty-nine thousand, five hundred three".