81541893162239 has 8 divisors (see below), whose sum is σ = 81699665501520. Its totient is φ = 81384125659200.

The previous prime is 81541893162161. The next prime is 81541893162241. The reversal of 81541893162239 is 93226139814518.

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

It is a cyclic number.

It is not a de Polignac number, because 81541893162239 - 2²⁴ = 81541876385023 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 (81541893102239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33507977 + ... + 35859005.

It is an arithmetic number, because the mean of its divisors is an integer number (10212458187690).

Almost surely, 2^{81541893162239} is an apocalyptic number.

81541893162239 is a deficient number, since it is larger than the sum of its proper divisors (157772339281).

81541893162239 is a wasteful number, since it uses less digits than its factorization.

81541893162239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2418121.

The product of its digits is 22394880, while the sum is 62.

The spelling of 81541893162239 in words is "eighty-one trillion, five hundred forty-one billion, eight hundred ninety-three million, one hundred sixty-two thousand, two hundred thirty-nine".