43665116405 has 8 divisors (see below), whose sum is σ = 52402400952. Its totient is φ = 34929252288.

The previous prime is 43665116387. The next prime is 43665116419. The reversal of 43665116405 is 50461156634.

43665116405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2032386724 + 41632729681 = 45082^2 + 204041^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 43665116405 - 2⁸ = 43665116149 is a prime.

It is a Duffinian number.

It is a Curzon number.

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, 286262 + ... + 411431.

It is an arithmetic number, because the mean of its divisors is an integer number (6550300119).

Almost surely, 2^43665116405 is an apocalyptic number.

It is an amenable number.

43665116405 is a deficient number, since it is larger than the sum of its proper divisors (8737284547).

43665116405 is a wasteful number, since it uses less digits than its factorization.

43665116405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710215.

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 43665116405 in words is "forty-three billion, six hundred sixty-five million, one hundred sixteen thousand, four hundred five".