81935653918 has 16 divisors (see below), whose sum is σ = 123465829824. Its totient is φ = 40780595200.

The previous prime is 81935653909. The next prime is 81935653949.

81935653918 is nontrivially palindromic in base 10.

It is a super-5 number, since 5×81935653918⁵ (a number of 56 digits) contains 55555 as substring.

It is a congruent number.

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, 710718 + ... + 817918.

It is an arithmetic number, because the mean of its divisors is an integer number (7716614364).

Almost surely, 2^81935653918 is an apocalyptic number.

81935653918 is a deficient number, since it is larger than the sum of its proper divisors (41530175906).

81935653918 is a wasteful number, since it uses less digits than its factorization.

81935653918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108947.

The product of its digits is 6998400, while the sum is 58.

The spelling of 81935653918 in words is "eighty-one billion, nine hundred thirty-five million, six hundred fifty-three thousand, nine hundred eighteen".