81752943520 has 48 divisors (see below), whose sum is σ = 193360396320. Its totient is φ = 32664086784.

The previous prime is 81752943499. The next prime is 81752943521. The reversal of 81752943520 is 2534925718.

It is not an unprimeable number, because it can be changed into a prime (81752943521) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 148050 + ... + 430609.

It is an arithmetic number, because the mean of its divisors is an integer number (4028341590).

Almost surely, 2^81752943520 is an apocalyptic number.

81752943520 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81752943520 is an abundant number, since it is smaller than the sum of its proper divisors (111607452800).

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

81752943520 is a wasteful number, since it uses less digits than its factorization.

81752943520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579557 (or 579549 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 46.

The spelling of 81752943520 in words is "eighty-one billion, seven hundred fifty-two million, nine hundred forty-three thousand, five hundred twenty".