18705141993 has 8 divisors (see below), whose sum is σ = 25015538656. Its totient is φ = 12432420000.

The previous prime is 18705141979. The next prime is 18705141997. The reversal of 18705141993 is 39914150781.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18705141993 - 2²⁶ = 18638033129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18705141997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9417508 + ... + 9419493.

It is an arithmetic number, because the mean of its divisors is an integer number (3126942332).

Almost surely, 2^18705141993 is an apocalyptic number.

It is an amenable number.

18705141993 is a deficient number, since it is larger than the sum of its proper divisors (6310396663).

18705141993 is a wasteful number, since it uses less digits than its factorization.

18705141993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18837335.

The product of its (nonzero) digits is 272160, while the sum is 48.

The spelling of 18705141993 in words is "eighteen billion, seven hundred five million, one hundred forty-one thousand, nine hundred ninety-three".