81015453305 has 4 divisors (see below), whose sum is σ = 97218543972. Its totient is φ = 64812362640.

The previous prime is 81015453269. The next prime is 81015453319. The reversal of 81015453305 is 50335451018.

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 43851710464 + 37163742841 = 209408^2 + 192779^2 .

It is not a de Polignac number, because 81015453305 - 2⁶ = 81015453241 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8101545326 + ... + 8101545335.

It is an arithmetic number, because the mean of its divisors is an integer number (24304635993).

Almost surely, 2^81015453305 is an apocalyptic number.

It is an amenable number.

81015453305 is a deficient number, since it is larger than the sum of its proper divisors (16203090667).

81015453305 is a wasteful number, since it uses less digits than its factorization.

81015453305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16203090666.

The product of its (nonzero) digits is 36000, while the sum is 35.

The spelling of 81015453305 in words is "eighty-one billion, fifteen million, four hundred fifty-three thousand, three hundred five".