109963865665 has 4 divisors (see below), whose sum is σ = 131956638804. Its totient is φ = 87971092528.

The previous prime is 109963865597. The next prime is 109963865677. The reversal of 109963865665 is 566568369901.

It is a Cunningham number, because it is equal to 331608²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566568369901 = 23 ⋅24633407387.

It can be written as a sum of positive squares in 2 ways, for example, as 39586673296 + 70377192369 = 198964^2 + 265287^2 .

It is a cyclic number.

It is not a de Polignac number, because 109963865665 - 2⁷ = 109963865537 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 109963865597 and 109963865606.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10996386562 + ... + 10996386571.

It is an arithmetic number, because the mean of its divisors is an integer number (32989159701).

Almost surely, 2^109963865665 is an apocalyptic number.

It is an amenable number.

109963865665 is a deficient number, since it is larger than the sum of its proper divisors (21992773139).

109963865665 is an equidigital number, since it uses as much as digits as its factorization.

109963865665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21992773138.

The product of its (nonzero) digits is 62985600, while the sum is 64.

The spelling of 109963865665 in words is "one hundred nine billion, nine hundred sixty-three million, eight hundred sixty-five thousand, six hundred sixty-five".