81005358142750 has 32 divisors (see below), whose sum is σ = 159623189949600. Its totient is φ = 30696767294400.

The previous prime is 81005358142741. The next prime is 81005358142771. The reversal of 81005358142750 is 5724185350018.

It is a junction number, because it is equal to n+sod(n) for n = 81005358142694 and 81005358142703.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8526875055 + ... + 8526884554.

It is an arithmetic number, because the mean of its divisors is an integer number (4988224685925).

Almost surely, 2^{81005358142750} is an apocalyptic number.

81005358142750 is a deficient number, since it is larger than the sum of its proper divisors (78617831806850).

81005358142750 is a wasteful number, since it uses less digits than its factorization.

81005358142750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17053759645 (or 17053759635 counting only the distinct ones).

The product of its (nonzero) digits is 1344000, while the sum is 49.

The spelling of 81005358142750 in words is "eighty-one trillion, five billion, three hundred fifty-eight million, one hundred forty-two thousand, seven hundred fifty".