81612131159 has 8 divisors (see below), whose sum is σ = 87896850720. Its totient is φ = 75328392096.

The previous prime is 81612131131. The next prime is 81612131173. The reversal of 81612131159 is 95113121618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81612131159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81612133159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67472 + ... + 409605.

It is an arithmetic number, because the mean of its divisors is an integer number (10987106340).

Almost surely, 2^81612131159 is an apocalyptic number.

81612131159 is a deficient number, since it is larger than the sum of its proper divisors (6284719561).

81612131159 is a wasteful number, since it uses less digits than its factorization.

81612131159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490249.

The product of its digits is 12960, while the sum is 38.

The spelling of 81612131159 in words is "eighty-one billion, six hundred twelve million, one hundred thirty-one thousand, one hundred fifty-nine".