81049814244 has 192 divisors, whose sum is σ = 257760115200. Its totient is φ = 21496098816.

The previous prime is 81049814231. The next prime is 81049814273. The reversal of 81049814244 is 44241894018.

81049814244 is a `hidden beast` number, since 8 + 10 + 498 + 142 + 4 + 4 = 666.

It is a super-3 number, since 3×81049814244³ (a number of 34 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81049814244.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 895002 + ... + 981390.

It is an arithmetic number, because the mean of its divisors is an integer number (1342500600).

Almost surely, 2^81049814244 is an apocalyptic number.

81049814244 is a gapful number since it is divisible by the number (84) 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 81049814244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128880057600).

81049814244 is an abundant number, since it is smaller than the sum of its proper divisors (176710300956).

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

81049814244 is a wasteful number, since it uses less digits than its factorization.

81049814244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86499 (or 86491 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 45.

The spelling of 81049814244 in words is "eighty-one billion, forty-nine million, eight hundred fourteen thousand, two hundred forty-four".