81343263528 has 64 divisors (see below), whose sum is σ = 229135996800. Its totient is φ = 26732522880.

The previous prime is 81343263461. The next prime is 81343263553. The reversal of 81343263528 is 82536234318.

81343263528 is a `hidden beast` number, since 8 + 1 + 3 + 4 + 3 + 2 + 635 + 2 + 8 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2636701 + ... + 2667372.

It is an arithmetic number, because the mean of its divisors is an integer number (3580249950).

Almost surely, 2^81343263528 is an apocalyptic number.

It is an amenable number.

81343263528 is an abundant number, since it is smaller than the sum of its proper divisors (147792733272).

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

81343263528 is a wasteful number, since it uses less digits than its factorization.

81343263528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5304159 (or 5304149 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The spelling of 81343263528 in words is "eighty-one billion, three hundred forty-three million, two hundred sixty-three thousand, five hundred twenty-eight".