81182332320 has 48 divisors (see below), whose sum is σ = 255724348320. Its totient is φ = 21648621824.

The previous prime is 81182332279. The next prime is 81182332351. The reversal of 81182332320 is 2323328118.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84564450 + ... + 84565409.

It is an arithmetic number, because the mean of its divisors is an integer number (5327590590).

Almost surely, 2^81182332320 is an apocalyptic number.

81182332320 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81182332320 is an abundant number, since it is smaller than the sum of its proper divisors (174542016000).

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

81182332320 is a wasteful number, since it uses less digits than its factorization.

81182332320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169129877 (or 169129869 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The spelling of 81182332320 in words is "eighty-one billion, one hundred eighty-two million, three hundred thirty-two thousand, three hundred twenty".