81883438818 has 16 divisors (see below), whose sum is σ = 168193009920. Its totient is φ = 26556790896.

The previous prime is 81883438789. The next prime is 81883438859.

81883438818 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×81883438818² (a number of 23 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, 184421938 + ... + 184422381.

It is an arithmetic number, because the mean of its divisors is an integer number (10512063120).

Almost surely, 2^81883438818 is an apocalyptic number.

81883438818 is an abundant number, since it is smaller than the sum of its proper divisors (86309571102).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81883438818 is a wasteful number, since it uses less digits than its factorization.

81883438818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368844361.

The product of its digits is 9437184, while the sum is 60.

The spelling of 81883438818 in words is "eighty-one billion, eight hundred eighty-three million, four hundred thirty-eight thousand, eight hundred eighteen".