18863646004793 has 4 divisors (see below), whose sum is σ = 19058116582260. Its totient is φ = 18669175427328.

The previous prime is 18863646004771. The next prime is 18863646004913. The reversal of 18863646004793 is 39740064636881.

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 10293811309609 + 8569834695184 = 3208397^2 + 2927428^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18863646004793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18863646007793) 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, 97235288588 + ... + 97235288781.

It is an arithmetic number, because the mean of its divisors is an integer number (4764529145565).

Almost surely, 2^{18863646004793} is an apocalyptic number.

It is an amenable number.

18863646004793 is a deficient number, since it is larger than the sum of its proper divisors (194470577467).

18863646004793 is an equidigital number, since it uses as much as digits as its factorization.

18863646004793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194470577466.

The product of its (nonzero) digits is 125411328, while the sum is 65.

The spelling of 18863646004793 in words is "eighteen trillion, eight hundred sixty-three billion, six hundred forty-six million, four thousand, seven hundred ninety-three".