81869788796818 has 16 divisors (see below), whose sum is σ = 133972924755456. Its totient is φ = 37212379403440.

The previous prime is 81869788796801. The next prime is 81869788796827.

81869788796818 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×81869788796818² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57326521 + ... + 58737292.

It is an arithmetic number, because the mean of its divisors is an integer number (8373307797216).

Almost surely, 2^{81869788796818} is an apocalyptic number.

81869788796818 is a deficient number, since it is larger than the sum of its proper divisors (52103135958638).

81869788796818 is a wasteful number, since it uses less digits than its factorization.

81869788796818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116095889.

The product of its digits is 37456183296, while the sum is 94.

The spelling of 81869788796818 in words is "eighty-one trillion, eight hundred sixty-nine billion, seven hundred eighty-eight million, seven hundred ninety-six thousand, eight hundred eighteen".