81075325505 has 16 divisors (see below), whose sum is σ = 103039245120. Its totient is φ = 61069578048.

The previous prime is 81075325493. The next prime is 81075325523. The reversal of 81075325505 is 50552357018.

It is a cyclic number.

It is not a de Polignac number, because 81075325505 - 2¹⁰ = 81075324481 is a prime.

It is a super-3 number, since 3×81075325505³ (a number of 34 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2602382 + ... + 2633351.

It is an arithmetic number, because the mean of its divisors is an integer number (6439952820).

Almost surely, 2^81075325505 is an apocalyptic number.

It is an amenable number.

81075325505 is a deficient number, since it is larger than the sum of its proper divisors (21963919615).

81075325505 is a wasteful number, since it uses less digits than its factorization.

81075325505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5235920.

The product of its (nonzero) digits is 210000, while the sum is 41.

The spelling of 81075325505 in words is "eighty-one billion, seventy-five million, three hundred twenty-five thousand, five hundred five".