81669096618 has 8 divisors (see below), whose sum is σ = 163338193248. Its totient is φ = 27223032204.

The previous prime is 81669096599. The next prime is 81669096623.

81669096618 is nontrivially palindromic in base 10.

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

81669096618 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6805758046 + ... + 6805758057.

It is an arithmetic number, because the mean of its divisors is an integer number (20417274156).

Almost surely, 2^81669096618 is an apocalyptic number.

81669096618 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81669096618 is a wasteful number, since it uses less digits than its factorization.

81669096618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13611516108.

The product of its (nonzero) digits is 6718464, while the sum is 60.

The spelling of 81669096618 in words is "eighty-one billion, six hundred sixty-nine million, ninety-six thousand, six hundred eighteen".