81804534510305 has 16 divisors (see below), whose sum is σ = 99510711802320. Its totient is φ = 64546790381568.

The previous prime is 81804534510301. The next prime is 81804534510337. The reversal of 81804534510305 is 50301543540818.

It can be written as a sum of positive squares in 8 ways, for example, as 9988943559841 + 71815590950464 = 3160529^2 + 8474408^2 .

It is a cyclic number.

It is not a de Polignac number, because 81804534510305 - 2² = 81804534510301 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81804534510305.

It is not an unprimeable number, because it can be changed into a prime (81804534510301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82570259 + ... + 83555111.

It is an arithmetic number, because the mean of its divisors is an integer number (6219419487645).

Almost surely, 2^{81804534510305} is an apocalyptic number.

It is an amenable number.

81804534510305 is a deficient number, since it is larger than the sum of its proper divisors (17706177292015).

81804534510305 is a wasteful number, since it uses less digits than its factorization.

81804534510305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1212500.

The product of its (nonzero) digits is 1152000, while the sum is 47.

The spelling of 81804534510305 in words is "eighty-one trillion, eight hundred four billion, five hundred thirty-four million, five hundred ten thousand, three hundred five".