18963321717 has 4 divisors (see below), whose sum is σ = 25284428960. Its totient is φ = 12642214476.

The previous prime is 18963321709. The next prime is 18963321731. The reversal of 18963321717 is 71712336981.

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 18963321717 - 2³ = 18963321709 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 (18963328717) 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, 3160553617 + ... + 3160553622.

It is an arithmetic number, because the mean of its divisors is an integer number (6321107240).

Almost surely, 2^18963321717 is an apocalyptic number.

It is an amenable number.

18963321717 is a deficient number, since it is larger than the sum of its proper divisors (6321107243).

18963321717 is an equidigital number, since it uses as much as digits as its factorization.

18963321717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6321107242.

The product of its digits is 381024, while the sum is 48.

The spelling of 18963321717 in words is "eighteen billion, nine hundred sixty-three million, three hundred twenty-one thousand, seven hundred seventeen".