81075545703523 has 16 divisors (see below), whose sum is σ = 92976216109056. Its totient is φ = 69254498982240.

The previous prime is 81075545703491. The next prime is 81075545703563. The reversal of 81075545703523 is 32530754557018.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 81075545703523 - 2⁵ = 81075545703491 is a prime.

It is a super-2 number, since 2×81075545703523² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81075545703563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90023590 + ... + 90919732.

It is an arithmetic number, because the mean of its divisors is an integer number (5811013506816).

Almost surely, 2^{81075545703523} is an apocalyptic number.

81075545703523 is a deficient number, since it is larger than the sum of its proper divisors (11900670405533).

81075545703523 is a wasteful number, since it uses less digits than its factorization.

81075545703523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940554.

The product of its (nonzero) digits is 17640000, while the sum is 55.

The spelling of 81075545703523 in words is "eighty-one trillion, seventy-five billion, five hundred forty-five million, seven hundred three thousand, five hundred twenty-three".