81812380848 has 80 divisors (see below), whose sum is σ = 230880389376. Its totient is φ = 24757413120.

The previous prime is 81812380789. The next prime is 81812380883. The reversal of 81812380848 is 84808321818.

It is a self number, because there is not a number n which added to its sum of digits gives 81812380848.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 277290 + ... + 490422.

Almost surely, 2^81812380848 is an apocalyptic number.

81812380848 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81812380848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115440194688).

81812380848 is an abundant number, since it is smaller than the sum of its proper divisors (149068008528).

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

81812380848 is a wasteful number, since it uses less digits than its factorization.

81812380848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213882 (or 213876 counting only the distinct ones).

The product of its (nonzero) digits is 786432, while the sum is 51.

The spelling of 81812380848 in words is "eighty-one billion, eight hundred twelve million, three hundred eighty thousand, eight hundred forty-eight".