43909968561 has 8 divisors (see below), whose sum is σ = 58553298720. Its totient is φ = 29269975392.

The previous prime is 43909968551. The next prime is 43909968577. The reversal of 43909968561 is 16586990934.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 43909968561 - 2⁶ = 43909968497 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 43909968495 and 43909968504.

It is not an unprimeable number, because it can be changed into a prime (43909968551) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 803380 + ... + 856293.

It is an arithmetic number, because the mean of its divisors is an integer number (7319162340).

Almost surely, 2^43909968561 is an apocalyptic number.

It is an amenable number.

43909968561 is a deficient number, since it is larger than the sum of its proper divisors (14643330159).

43909968561 is a wasteful number, since it uses less digits than its factorization.

43909968561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1668495.

The product of its (nonzero) digits is 12597120, while the sum is 60.

The spelling of 43909968561 in words is "forty-three billion, nine hundred nine million, nine hundred sixty-eight thousand, five hundred sixty-one".