81343539283045 has 16 divisors (see below), whose sum is σ = 106204601971440. Its totient is φ = 59449806342144.

The previous prime is 81343539283033. The next prime is 81343539283051. The reversal of 81343539283045 is 54038293534318.

It can be written as a sum of positive squares in 8 ways, for example, as 13959683622756 + 67383855660289 = 3736266^2 + 8208767^2 .

It is a cyclic number.

It is not a de Polignac number, because 81343539283045 - 2²¹ = 81343537185893 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6450710530 + ... + 6450723139.

It is an arithmetic number, because the mean of its divisors is an integer number (6637787623215).

Almost surely, 2^{81343539283045} is an apocalyptic number.

It is an amenable number.

81343539283045 is a deficient number, since it is larger than the sum of its proper divisors (24861062688395).

81343539283045 is a wasteful number, since it uses less digits than its factorization.

81343539283045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12901433784.

The product of its (nonzero) digits is 37324800, while the sum is 58.

The spelling of 81343539283045 in words is "eighty-one trillion, three hundred forty-three billion, five hundred thirty-nine million, two hundred eighty-three thousand, forty-five".