81018044679936 has 1728 divisors, whose sum is σ = 286983847772160. Its totient is φ = 20080025763840.

The previous prime is 81018044679899. The next prime is 81018044679983. The reversal of 81018044679936 is 63997644081018.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 184551354405 + ... + 184551354843.

Almost surely, 2^{81018044679936} is an apocalyptic number.

81018044679936 is a gapful number since it is divisible by the number (86) 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 81018044679936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143491923886080).

81018044679936 is an abundant number, since it is smaller than the sum of its proper divisors (205965803092224).

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

81018044679936 is a wasteful number, since it uses less digits than its factorization.

81018044679936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842 (or 821 counting only the distinct ones).

The product of its (nonzero) digits is 62705664, while the sum is 66.

The spelling of 81018044679936 in words is "eighty-one trillion, eighteen billion, forty-four million, six hundred seventy-nine thousand, nine hundred thirty-six".