81312136055 has 8 divisors (see below), whose sum is σ = 98809684800. Its totient is φ = 64226294496.

The previous prime is 81312136027. The next prime is 81312136067. The reversal of 81312136055 is 55063121318.

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 81312136055 - 2²⁴ = 81295358839 is a prime.

It is a super-2 number, since 2×81312136055² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 102926360 + ... + 102927149.

It is an arithmetic number, because the mean of its divisors is an integer number (12351210600).

Almost surely, 2^81312136055 is an apocalyptic number.

81312136055 is a deficient number, since it is larger than the sum of its proper divisors (17497548745).

81312136055 is a wasteful number, since it uses less digits than its factorization.

81312136055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205853593.

The product of its (nonzero) digits is 21600, while the sum is 35.

The spelling of 81312136055 in words is "eighty-one billion, three hundred twelve million, one hundred thirty-six thousand, fifty-five".