81051432200 has 108 divisors (see below), whose sum is σ = 193547079735. Its totient is φ = 31565408000.

The previous prime is 81051432191. The next prime is 81051432281. The reversal of 81051432200 is 223415018.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 5 ways, for example, as 510127396 + 80541304804 = 22586^2 + 283798^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=201310.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 81051432200.

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 26 ways as a sum of consecutive naturals, for example, 165073955 + ... + 165074445.

Almost surely, 2^81051432200 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81051432200

81051432200 is an abundant number, since it is smaller than the sum of its proper divisors (112495647535).

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

81051432200 is an equidigital number, since it uses as much as digits as its factorization.

81051432200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080 (or 539 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 81051432200 its reverse (223415018), we get a palindrome (81274847218).

The spelling of 81051432200 in words is "eighty-one billion, fifty-one million, four hundred thirty-two thousand, two hundred".