81852686775 has 18 divisors (see below), whose sum is σ = 146607257160. Its totient is φ = 43654766160.

The previous prime is 81852686743. The next prime is 81852686803. The reversal of 81852686775 is 57768625818.

It is not a de Polignac number, because 81852686775 - 2⁵ = 81852686743 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 181894635 + ... + 181895084.

It is an arithmetic number, because the mean of its divisors is an integer number (8144847620).

Almost surely, 2^81852686775 is an apocalyptic number.

81852686775 is a deficient number, since it is larger than the sum of its proper divisors (64754570385).

81852686775 is a wasteful number, since it uses less digits than its factorization.

81852686775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363789735 (or 363789727 counting only the distinct ones).

The product of its digits is 45158400, while the sum is 63.

The spelling of 81852686775 in words is "eighty-one billion, eight hundred fifty-two million, six hundred eighty-six thousand, seven hundred seventy-five".