81678854146 has 8 divisors (see below), whose sum is σ = 122550559740. Its totient is φ = 40828667568.

The previous prime is 81678854141. The next prime is 81678854183. The reversal of 81678854146 is 64145887618.

It can be written as a sum of positive squares in 2 ways, for example, as 66571740225 + 15107113921 = 258015^2 + 122911^2 .

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

It is not an unprimeable number, because it can be changed into a prime (81678854141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5370261 + ... + 5385448.

Almost surely, 2^81678854146 is an apocalyptic number.

81678854146 is a deficient number, since it is larger than the sum of its proper divisors (40871705594).

81678854146 is a wasteful number, since it uses less digits than its factorization.

81678854146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10759508.

The product of its digits is 10321920, while the sum is 58.

The spelling of 81678854146 in words is "eighty-one billion, six hundred seventy-eight million, eight hundred fifty-four thousand, one hundred forty-six".