81648084618 has 32 divisors (see below), whose sum is σ = 185865563520. Its totient is φ = 26552221920.

The previous prime is 81648084613. The next prime is 81648084689.

It is a happy number.

81648084618 is a `hidden beast` number, since 8 + 16 + 4 + 8 + 0 + 8 + 4 + 618 = 666.

81648084618 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (81648084613) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18436830 + ... + 18441257.

It is an arithmetic number, because the mean of its divisors is an integer number (5808298860).

Almost surely, 2^81648084618 is an apocalyptic number.

81648084618 is an abundant number, since it is smaller than the sum of its proper divisors (104217478902).

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

81648084618 is a wasteful number, since it uses less digits than its factorization.

81648084618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36878139 (or 36878133 counting only the distinct ones).

The product of its (nonzero) digits is 2359296, while the sum is 54.

The spelling of 81648084618 in words is "eighty-one billion, six hundred forty-eight million, eighty-four thousand, six hundred eighteen".