81510457273 has 16 divisors (see below), whose sum is σ = 98229514240. Its totient is φ = 66072963600.

The previous prime is 81510457271. The next prime is 81510457313. The reversal of 81510457273 is 37275401518.

It is not a de Polignac number, because 81510457273 - 2¹ = 81510457271 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81510457271) 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, 460713 + ... + 612598.

It is an arithmetic number, because the mean of its divisors is an integer number (6139344640).

Almost surely, 2^81510457273 is an apocalyptic number.

It is an amenable number.

81510457273 is a deficient number, since it is larger than the sum of its proper divisors (16719056967).

81510457273 is a wasteful number, since it uses less digits than its factorization.

81510457273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073908.

The product of its (nonzero) digits is 235200, while the sum is 43.

The spelling of 81510457273 in words is "eighty-one billion, five hundred ten million, four hundred fifty-seven thousand, two hundred seventy-three".