81804534510317 has 4 divisors (see below), whose sum is σ = 81804594367356. Its totient is φ = 81804474653280.

The previous prime is 81804534510301. The next prime is 81804534510337. The reversal of 81804534510317 is 71301543540818.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52844089127236 + 28960445383081 = 7269394^2 + 5381491^2 .

It is a cyclic number.

It is not a de Polignac number, because 81804534510317 - 2⁴ = 81804534510301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81804534510337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27829448 + ... + 30628209.

It is an arithmetic number, because the mean of its divisors is an integer number (20451148591839).

Almost surely, 2^{81804534510317} is an apocalyptic number.

It is an amenable number.

81804534510317 is a deficient number, since it is larger than the sum of its proper divisors (59857039).

81804534510317 is a wasteful number, since it uses less digits than its factorization.

81804534510317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59857038.

The product of its (nonzero) digits is 1612800, while the sum is 50.

The spelling of 81804534510317 in words is "eighty-one trillion, eight hundred four billion, five hundred thirty-four million, five hundred ten thousand, three hundred seventeen".