81576446842 has 8 divisors (see below), whose sum is σ = 133488731232. Its totient is φ = 37080203100.

The previous prime is 81576446803. The next prime is 81576446869. The reversal of 81576446842 is 24864467518.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1854010134 + ... + 1854010177.

It is an arithmetic number, because the mean of its divisors is an integer number (16686091404).

Almost surely, 2^81576446842 is an apocalyptic number.

81576446842 is a deficient number, since it is larger than the sum of its proper divisors (51912284390).

81576446842 is a wasteful number, since it uses less digits than its factorization.

81576446842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3708020324.

The product of its digits is 10321920, while the sum is 55.

The spelling of 81576446842 in words is "eighty-one billion, five hundred seventy-six million, four hundred forty-six thousand, eight hundred forty-two".