81063045504 has 384 divisors, whose sum is σ = 271522368000. Its totient is φ = 22736609280.

The previous prime is 81063045473. The next prime is 81063045529. The reversal of 81063045504 is 40554036018.

It is a happy number.

81063045504 is a `hidden beast` number, since 8 + 10 + 630 + 4 + 5 + 5 + 0 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is a super-2 number, since 2×81063045504² (a number of 23 digits) contains 22 as substring.

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 polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 128467269 + ... + 128467899.

It is an arithmetic number, because the mean of its divisors is an integer number (707089500).

Almost surely, 2^81063045504 is an apocalyptic number.

81063045504 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 81063045504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135761184000).

81063045504 is an abundant number, since it is smaller than the sum of its proper divisors (190459322496).

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

81063045504 is a wasteful number, since it uses less digits than its factorization.

81063045504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926 (or 911 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The spelling of 81063045504 in words is "eighty-one billion, sixty-three million, forty-five thousand, five hundred four".