81648084619 has 16 divisors (see below), whose sum is σ = 87940844640. Its totient is φ = 75521605120.

The previous prime is 81648084613. The next prime is 81648084689. The reversal of 81648084619 is 91648084618.

It is a happy number.

It is not a de Polignac number, because 81648084619 - 2¹⁵ = 81648051851 is a prime.

It is a super-2 number, since 2×81648084619² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81648084619.

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

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 15 ways as a sum of consecutive naturals, for example, 4425057 + ... + 4443469.

It is an arithmetic number, because the mean of its divisors is an integer number (5496302790).

Almost surely, 2^81648084619 is an apocalyptic number.

81648084619 is a deficient number, since it is larger than the sum of its proper divisors (6292760021).

81648084619 is a wasteful number, since it uses less digits than its factorization.

81648084619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22910.

The product of its (nonzero) digits is 2654208, while the sum is 55.

Subtracting 81648084619 from its reverse (91648084618), we obtain a palindrome (9999999999).

The spelling of 81648084619 in words is "eighty-one billion, six hundred forty-eight million, eighty-four thousand, six hundred nineteen".