81527209345 has 12 divisors (see below), whose sum is σ = 103252744980. Its totient is φ = 61789041504.

The previous prime is 81527209277. The next prime is 81527209363. The reversal of 81527209345 is 54390272518.

It can be written as a sum of positive squares in 2 ways, for example, as 38068302321 + 43458907024 = 195111^2 + 208468^2 .

It is not a de Polignac number, because 81527209345 - 2¹¹ = 81527207297 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81527209295 and 81527209304.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22581910 + ... + 22585519.

It is an arithmetic number, because the mean of its divisors is an integer number (8604395415).

Almost surely, 2^81527209345 is an apocalyptic number.

It is an amenable number.

81527209345 is a deficient number, since it is larger than the sum of its proper divisors (21725535635).

81527209345 is a wasteful number, since it uses less digits than its factorization.

81527209345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45167472 (or 45167453 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 46.

The spelling of 81527209345 in words is "eighty-one billion, five hundred twenty-seven million, two hundred nine thousand, three hundred forty-five".