81271342588 has 24 divisors (see below), whose sum is σ = 147537996480. Its totient is φ = 39142721280.

The previous prime is 81271342561. The next prime is 81271342591. The reversal of 81271342588 is 88524317218.

It is a happy number.

It is a super-2 number, since 2×81271342588² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3123481 + ... + 3149392.

It is an arithmetic number, because the mean of its divisors is an integer number (6147416520).

Almost surely, 2^81271342588 is an apocalyptic number.

It is an amenable number.

81271342588 is a deficient number, since it is larger than the sum of its proper divisors (66266653892).

81271342588 is a wasteful number, since it uses less digits than its factorization.

81271342588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6272997 (or 6272995 counting only the distinct ones).

The product of its digits is 860160, while the sum is 49.

The spelling of 81271342588 in words is "eighty-one billion, two hundred seventy-one million, three hundred forty-two thousand, five hundred eighty-eight".