81118973319 has 8 divisors (see below), whose sum is σ = 108822181632. Its totient is φ = 53747540280.

The previous prime is 81118973303. The next prime is 81118973323. The reversal of 81118973319 is 91337981118.

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

It is not a de Polignac number, because 81118973319 - 2⁴ = 81118973303 is a prime.

It is a super-2 number, since 2×81118973319² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81118973329) 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 7 ways as a sum of consecutive naturals, for example, 82943247 + ... + 82944224.

It is an arithmetic number, because the mean of its divisors is an integer number (13602772704).

Almost surely, 2^81118973319 is an apocalyptic number.

81118973319 is a deficient number, since it is larger than the sum of its proper divisors (27703208313).

81118973319 is a wasteful number, since it uses less digits than its factorization.

81118973319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165887637.

The product of its digits is 326592, while the sum is 51.

The spelling of 81118973319 in words is "eighty-one billion, one hundred eighteen million, nine hundred seventy-three thousand, three hundred nineteen".