81334382160 has 80 divisors (see below), whose sum is σ = 253950621120. Its totient is φ = 21533122560.

The previous prime is 81334382159. The next prime is 81334382167. The reversal of 81334382160 is 6128343318.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81334382167) 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 15 ways as a sum of consecutive naturals, for example, 1185681 + ... + 1252400.

It is an arithmetic number, because the mean of its divisors is an integer number (3174382764).

Almost surely, 2^81334382160 is an apocalyptic number.

81334382160 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81334382160 is an abundant number, since it is smaller than the sum of its proper divisors (172616238960).

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

81334382160 is a wasteful number, since it uses less digits than its factorization.

81334382160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2438236 (or 2438230 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 39.

The spelling of 81334382160 in words is "eighty-one billion, three hundred thirty-four million, three hundred eighty-two thousand, one hundred sixty".