81255655218 has 16 divisors (see below), whose sum is σ = 162585917280. Its totient is φ = 27072783936.

The previous prime is 81255655207. The next prime is 81255655237.

81255655218 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3094455 + ... + 3120602.

It is an arithmetic number, because the mean of its divisors is an integer number (10161619830).

Almost surely, 2^81255655218 is an apocalyptic number.

81255655218 is an abundant number, since it is smaller than the sum of its proper divisors (81330262062).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81255655218 is a wasteful number, since it uses less digits than its factorization.

81255655218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6217241.

The product of its digits is 960000, while the sum is 48.

The spelling of 81255655218 in words is "eighty-one billion, two hundred fifty-five million, six hundred fifty-five thousand, two hundred eighteen".