81648284618 has 8 divisors (see below), whose sum is σ = 122473755012. Its totient is φ = 40823699616.

The previous prime is 81648284567. The next prime is 81648284687.

81648284618 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 81232410169 + 415874449 = 285013^2 + 20393^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106046 + ... + 417782.

Almost surely, 2^81648284618 is an apocalyptic number.

81648284618 is a deficient number, since it is larger than the sum of its proper divisors (40825470394).

81648284618 is a wasteful number, since it uses less digits than its factorization.

81648284618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442696.

The product of its digits is 4718592, while the sum is 56.

The spelling of 81648284618 in words is "eighty-one billion, six hundred forty-eight million, two hundred eighty-four thousand, six hundred eighteen".