81343541543878 has 8 divisors (see below), whose sum is σ = 122015351724120. Its totient is φ = 40671757635840.

The previous prime is 81343541543851. The next prime is 81343541543879. The reversal of 81343541543878 is 87834514534318.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81343541543879) 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 3 ways as a sum of consecutive naturals, for example, 5924998 + ... + 14063878.

It is an arithmetic number, because the mean of its divisors is an integer number (15251918965515).

Almost surely, 2^{81343541543878} is an apocalyptic number.

81343541543878 is a deficient number, since it is larger than the sum of its proper divisors (40671810180242).

81343541543878 is a wasteful number, since it uses less digits than its factorization.

81343541543878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13136102.

The product of its digits is 154828800, while the sum is 64.

The spelling of 81343541543878 in words is "eighty-one trillion, three hundred forty-three billion, five hundred forty-one million, five hundred forty-three thousand, eight hundred seventy-eight".