81213547008 has 80 divisors (see below), whose sum is σ = 236026920096. Its totient is φ = 24610160640.

The previous prime is 81213546983. The next prime is 81213547013. The reversal of 81213547008 is 80074531218.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2386441 + ... + 2420232.

Almost surely, 2^81213547008 is an apocalyptic number.

81213547008 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

81213547008 is an abundant number, since it is smaller than the sum of its proper divisors (154813373088).

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

81213547008 is a wasteful number, since it uses less digits than its factorization.

81213547008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4806705 (or 4806689 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 39.

The spelling of 81213547008 in words is "eighty-one billion, two hundred thirteen million, five hundred forty-seven thousand, eight".