81452044800 has 1680 divisors, whose sum is σ = 366033983040. Its totient is φ = 17557585920.

The previous prime is 81452044777. The next prime is 81452044837. The reversal of 81452044800 is 844025418.

81452044800 is a `hidden beast` number, since 8 + 14 + 520 + 44 + 80 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1680).

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 (17) of ones.

It is a polite number, since it can be written in 167 ways as a sum of consecutive naturals, for example, 1894233579 + ... + 1894233621.

Almost surely, 2^81452044800 is an apocalyptic number.

81452044800 is a gapful number since it is divisible by the number (80) 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 81452044800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183016991520).

81452044800 is an abundant number, since it is smaller than the sum of its proper divisors (284581938240).

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

81452044800 is an equidigital number, since it uses as much as digits as its factorization.

81452044800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 40960, while the sum is 36.

The spelling of 81452044800 in words is "eighty-one billion, four hundred fifty-two million, forty-four thousand, eight hundred".