81606882848 has 24 divisors (see below), whose sum is σ = 162599261328. Its totient is φ = 40311832384.

The previous prime is 81606882829. The next prime is 81606882923. The reversal of 81606882848 is 84828860618.

It is a super-2 number, since 2×81606882848² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15360086 + ... + 15365397.

It is an arithmetic number, because the mean of its divisors is an integer number (6774969222).

Almost surely, 2^81606882848 is an apocalyptic number.

It is an amenable number.

81606882848 is a deficient number, since it is larger than the sum of its proper divisors (80992378480).

81606882848 is a wasteful number, since it uses less digits than its factorization.

81606882848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30725576 (or 30725568 counting only the distinct ones).

The product of its (nonzero) digits is 9437184, while the sum is 59.

The spelling of 81606882848 in words is "eighty-one billion, six hundred six million, eight hundred eighty-two thousand, eight hundred forty-eight".