81203555308 has 96 divisors (see below), whose sum is σ = 163919669760. Its totient is φ = 34952186880.

The previous prime is 81203555299. The next prime is 81203555341. The reversal of 81203555308 is 80355530218.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6255841 + ... + 6268807.

It is an arithmetic number, because the mean of its divisors is an integer number (1707496560).

Almost surely, 2^81203555308 is an apocalyptic number.

It is an amenable number.

81203555308 is an abundant number, since it is smaller than the sum of its proper divisors (82716114452).

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

81203555308 is a wasteful number, since it uses less digits than its factorization.

81203555308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13175 (or 13173 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 40.

The spelling of 81203555308 in words is "eighty-one billion, two hundred three million, five hundred fifty-five thousand, three hundred eight".