81184220888306 has 4 divisors (see below), whose sum is σ = 121776331332462. Its totient is φ = 40592110444152.

The previous prime is 81184220888263. The next prime is 81184220888321. The reversal of 81184220888306 is 60388802248118.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 78982234968025 + 2201985920281 = 8887195^2 + 1483909^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20296055222075 + ... + 20296055222078.

Almost surely, 2^{81184220888306} is an apocalyptic number.

81184220888306 is a deficient number, since it is larger than the sum of its proper divisors (40592110444156).

81184220888306 is a wasteful number, since it uses less digits than its factorization.

81184220888306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40592110444155.

The product of its (nonzero) digits is 9437184, while the sum is 59.

The spelling of 81184220888306 in words is "eighty-one trillion, one hundred eighty-four billion, two hundred twenty million, eight hundred eighty-eight thousand, three hundred six".