81930212896 has 96 divisors (see below), whose sum is σ = 196048605312. Its totient is φ = 32901550080.

The previous prime is 81930212867. The next prime is 81930212977. The reversal of 81930212896 is 69821203918.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 817026 + ... + 911806.

It is an arithmetic number, because the mean of its divisors is an integer number (2042172972).

Almost surely, 2^81930212896 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81930212896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98024302656).

81930212896 is an abundant number, since it is smaller than the sum of its proper divisors (114118392416).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81930212896 is a wasteful number, since it uses less digits than its factorization.

81930212896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95042 (or 95034 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 49.

The spelling of 81930212896 in words is "eighty-one billion, nine hundred thirty million, two hundred twelve thousand, eight hundred ninety-six".