81742522160 has 80 divisors (see below), whose sum is σ = 206658064704. Its totient is φ = 29888787456.

The previous prime is 81742522139. The next prime is 81742522163. The reversal of 81742522160 is 6122524718.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (81742522163) 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 15 ways as a sum of consecutive naturals, for example, 274427 + ... + 488666.

Almost surely, 2^81742522160 is an apocalyptic number.

81742522160 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81742522160 is an abundant number, since it is smaller than the sum of its proper divisors (124915542544).

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

81742522160 is a wasteful number, since it uses less digits than its factorization.

81742522160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 763222 (or 763216 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 38.

The spelling of 81742522160 in words is "eighty-one billion, seven hundred forty-two million, five hundred twenty-two thousand, one hundred sixty".