43963665409 has 4 divisors (see below), whose sum is σ = 44390497216. Its totient is φ = 43536833604.

The previous prime is 43963665407. The next prime is 43963665463. The reversal of 43963665409 is 90456636934.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 43963665409 - 2¹ = 43963665407 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43963665409.

It is not an unprimeable number, because it can be changed into a prime (43963665407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213415749 + ... + 213415954.

It is an arithmetic number, because the mean of its divisors is an integer number (11097624304).

Almost surely, 2^43963665409 is an apocalyptic number.

It is an amenable number.

43963665409 is a deficient number, since it is larger than the sum of its proper divisors (426831807).

43963665409 is a wasteful number, since it uses less digits than its factorization.

43963665409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426831806.

The product of its (nonzero) digits is 12597120, while the sum is 55.

The spelling of 43963665409 in words is "forty-three billion, nine hundred sixty-three million, six hundred sixty-five thousand, four hundred nine".