81943211234918 has 32 divisors (see below), whose sum is σ = 135418681857312. Its totient is φ = 36877539744000.

The previous prime is 81943211234917. The next prime is 81943211234939.

81943211234918 is nontrivially palindromic in base 10.

It is a super-3 number, since 3×81943211234918³ (a number of 43 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81943211234917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156551930 + ... + 157074482.

It is an arithmetic number, because the mean of its divisors is an integer number (4231833808041).

Almost surely, 2^{81943211234918} is an apocalyptic number.

81943211234918 is a deficient number, since it is larger than the sum of its proper divisors (53475470622394).

81943211234918 is a wasteful number, since it uses less digits than its factorization.

81943211234918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593240.

The product of its digits is 2985984, while the sum is 56.

The spelling of 81943211234918 in words is "eighty-one trillion, nine hundred forty-three billion, two hundred eleven million, two hundred thirty-four thousand, nine hundred eighteen".