81604881419 has 8 divisors (see below), whose sum is σ = 82048562400. Its totient is φ = 81161536896.

The previous prime is 81604881403. The next prime is 81604881427. The reversal of 81604881419 is 91418840618.

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

It is a cyclic number.

It is not a de Polignac number, because 81604881419 - 2⁴ = 81604881403 is a prime.

It is a super-3 number, since 3×81604881419³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81604883419) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 410147 + ... + 575699.

It is an arithmetic number, because the mean of its divisors is an integer number (10256070300).

Almost surely, 2^81604881419 is an apocalyptic number.

81604881419 is a deficient number, since it is larger than the sum of its proper divisors (443680981).

81604881419 is a wasteful number, since it uses less digits than its factorization.

81604881419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168229.

The product of its (nonzero) digits is 442368, while the sum is 50.

The spelling of 81604881419 in words is "eighty-one billion, six hundred four million, eight hundred eighty-one thousand, four hundred nineteen".