81301343717072 has 20 divisors (see below), whose sum is σ = 158578543748100. Its totient is φ = 40377848556288.

The previous prime is 81301343717047. The next prime is 81301343717089. The reversal of 81301343717072 is 27071734310318.

It can be written as a sum of positive squares in 2 ways, for example, as 20753710029376 + 60547633687696 = 4555624^2 + 7781236^2 .

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 3 ways as a sum of consecutive naturals, for example, 17051453933 + ... + 17051458700.

It is an arithmetic number, because the mean of its divisors is an integer number (7928927187405).

Almost surely, 2^{81301343717072} is an apocalyptic number.

It is an amenable number.

81301343717072 is a deficient number, since it is larger than the sum of its proper divisors (77277200031028).

81301343717072 is a wasteful number, since it uses less digits than its factorization.

81301343717072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34102912790 (or 34102912784 counting only the distinct ones).

The product of its (nonzero) digits is 592704, while the sum is 47.

The spelling of 81301343717072 in words is "eighty-one trillion, three hundred one billion, three hundred forty-three million, seven hundred seventeen thousand, seventy-two".