81184880009 has 16 divisors (see below), whose sum is σ = 90251884800. Its totient is φ = 72673353984.

The previous prime is 81184879981. The next prime is 81184880027. The reversal of 81184880009 is 90008848118.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81184880009 is a prime.

It is a super-3 number, since 3×81184880009³ (a number of 34 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (81184880059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1195889 + ... + 1261950.

It is an arithmetic number, because the mean of its divisors is an integer number (5640742800).

Almost surely, 2^81184880009 is an apocalyptic number.

It is an amenable number.

81184880009 is a deficient number, since it is larger than the sum of its proper divisors (9067004791).

81184880009 is a wasteful number, since it uses less digits than its factorization.

81184880009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2457952.

The product of its (nonzero) digits is 147456, while the sum is 47.

The spelling of 81184880009 in words is "eighty-one billion, one hundred eighty-four million, eight hundred eighty thousand, nine".