81350451522 has 30 divisors (see below), whose sum is σ = 182293405833. Its totient is φ = 27115607088.

The previous prime is 81350451463. The next prime is 81350451541. The reversal of 81350451522 is 22515405318.

81350451522 is a `hidden beast` number, since 8 + 135 + 0 + 4 + 515 + 2 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 81042133041 + 308318481 = 284679^2 + 17559^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=201681.

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 14 ways as a sum of consecutive naturals, for example, 3619054 + ... + 3641462.

Almost surely, 2^81350451522 is an apocalyptic number.

81350451522 is an abundant number, since it is smaller than the sum of its proper divisors (100942954311).

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

81350451522 is an frugal number, since it uses more digits than its factorization.

81350451522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44832 (or 22414 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

The spelling of 81350451522 in words is "eighty-one billion, three hundred fifty million, four hundred fifty-one thousand, five hundred twenty-two".