81100882044 has 288 divisors, whose sum is σ = 273908544000. Its totient is φ = 20262887424.

The previous prime is 81100882003. The next prime is 81100882081. The reversal of 81100882044 is 44028800118.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 2410812 + ... + 2444220.

Almost surely, 2^81100882044 is an apocalyptic number.

81100882044 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 81100882044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136954272000).

81100882044 is an abundant number, since it is smaller than the sum of its proper divisors (192807661956).

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

81100882044 is a wasteful number, since it uses less digits than its factorization.

81100882044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33474 (or 33453 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 36.

The spelling of 81100882044 in words is "eighty-one billion, one hundred million, eight hundred eighty-two thousand, forty-four".