81203530752 has 88 divisors (see below), whose sum is σ = 240485654000. Its totient is φ = 27067834368.

The previous prime is 81203530747. The next prime is 81203530769. The reversal of 81203530752 is 25703530218.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1440877 + ... + 1496172.

Almost surely, 2^81203530752 is an apocalyptic number.

It is an amenable number.

81203530752 is an abundant number, since it is smaller than the sum of its proper divisors (159282123248).

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

81203530752 is a wasteful number, since it uses less digits than its factorization.

81203530752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2937078 (or 2937054 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The spelling of 81203530752 in words is "eighty-one billion, two hundred three million, five hundred thirty thousand, seven hundred fifty-two".