81064517583 has 16 divisors (see below), whose sum is σ = 130028299520. Its totient is φ = 43884550656.

The previous prime is 81064517581. The next prime is 81064517641. The reversal of 81064517583 is 38571546018.

It is not a de Polignac number, because 81064517583 - 2¹ = 81064517581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81064517581) 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, 101584210 + ... + 101585007.

It is an arithmetic number, because the mean of its divisors is an integer number (8126768720).

Almost surely, 2^81064517583 is an apocalyptic number.

81064517583 is a deficient number, since it is larger than the sum of its proper divisors (48963781937).

81064517583 is a wasteful number, since it uses less digits than its factorization.

81064517583 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203169246.

The product of its (nonzero) digits is 806400, while the sum is 48.

The spelling of 81064517583 in words is "eighty-one billion, sixty-four million, five hundred seventeen thousand, five hundred eighty-three".