8518355723891 has 12 divisors (see below), whose sum is σ = 9241068368880. Its totient is φ = 7848563130720.

The previous prime is 8518355723879. The next prime is 8518355723929. The reversal of 8518355723891 is 1983275538158.

It is a de Polignac number, because none of the positive numbers 2^k-8518355723891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8518355723821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46493111 + ... + 46675968.

It is an arithmetic number, because the mean of its divisors is an integer number (770089030740).

Almost surely, 2^{8518355723891} is an apocalyptic number.

8518355723891 is a deficient number, since it is larger than the sum of its proper divisors (722712644989).

8518355723891 is a wasteful number, since it uses less digits than its factorization.

8518355723891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93169646 (or 93169633 counting only the distinct ones).

The product of its digits is 72576000, while the sum is 65.

The spelling of 8518355723891 in words is "eight trillion, five hundred eighteen billion, three hundred fifty-five million, seven hundred twenty-three thousand, eight hundred ninety-one".