81803917160 has 128 divisors (see below), whose sum is σ = 217174487040. Its totient is φ = 27145497600.

The previous prime is 81803917121. The next prime is 81803917163. The reversal of 81803917160 is 6171930818.

It is not an unprimeable number, because it can be changed into a prime (81803917163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1958090 + ... + 1999430.

It is an arithmetic number, because the mean of its divisors is an integer number (1696675680).

Almost surely, 2^81803917160 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 81803917160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108587243520).

81803917160 is an abundant number, since it is smaller than the sum of its proper divisors (135370569880).

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

81803917160 is a wasteful number, since it uses less digits than its factorization.

81803917160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41587 (or 41583 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 44.

The spelling of 81803917160 in words is "eighty-one billion, eight hundred three million, nine hundred seventeen thousand, one hundred sixty".