81871064486 has 16 divisors (see below), whose sum is σ = 129289441200. Its totient is φ = 38775228768.

The previous prime is 81871064453. The next prime is 81871064491. The reversal of 81871064486 is 68446017818.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101756 + ... + 417248.

It is an arithmetic number, because the mean of its divisors is an integer number (8080590075).

Almost surely, 2^81871064486 is an apocalyptic number.

81871064486 is a deficient number, since it is larger than the sum of its proper divisors (47418376714).

81871064486 is a wasteful number, since it uses less digits than its factorization.

81871064486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322343.

The product of its (nonzero) digits is 2064384, while the sum is 53.

The spelling of 81871064486 in words is "eighty-one billion, eight hundred seventy-one million, sixty-four thousand, four hundred eighty-six".