81502200000 has 1176 divisors, whose sum is σ = 333992591856. Its totient is φ = 19595520000.

The previous prime is 81502199993. The next prime is 81502200047. The reversal of 81502200000 is 220518.

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 1895399979 + ... + 1895400021.

It is an arithmetic number, because the mean of its divisors is an integer number (284007306).

Almost surely, 2^81502200000 is an apocalyptic number.

81502200000 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 81502200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166996295928).

81502200000 is an abundant number, since it is smaller than the sum of its proper divisors (252490391856).

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

81502200000 is an frugal number, since it uses more digits than its factorization.

81502200000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111 (or 66 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

Adding to 81502200000 its reverse (220518), we get a palindrome (81502420518).

The spelling of 81502200000 in words is "eighty-one billion, five hundred two million, two hundred thousand".