81678487618 has 32 divisors (see below), whose sum is σ = 150901341696. Its totient is φ = 32288735808.

The previous prime is 81678487591. The next prime is 81678487633.

81678487618 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 81678487618.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86455 + ... + 413317.

It is an arithmetic number, because the mean of its divisors is an integer number (4715666928).

Almost surely, 2^81678487618 is an apocalyptic number.

81678487618 is a deficient number, since it is larger than the sum of its proper divisors (69222854078).

81678487618 is a wasteful number, since it uses less digits than its factorization.

81678487618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328258.

The product of its digits is 28901376, while the sum is 64.

The spelling of 81678487618 in words is "eighty-one billion, six hundred seventy-eight million, four hundred eighty-seven thousand, six hundred eighteen".