43393305661 has 4 divisors (see below), whose sum is σ = 43393925500. Its totient is φ = 43392685824.

The previous prime is 43393305623. The next prime is 43393305673. The reversal of 43393305661 is 16650339334.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20486483161 + 22906822500 = 143131^2 + 151350^2 .

It is a cyclic number.

It is not a de Polignac number, because 43393305661 - 2²⁷ = 43259087933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43393365661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189246 + ... + 350143.

It is an arithmetic number, because the mean of its divisors is an integer number (10848481375).

Almost surely, 2^43393305661 is an apocalyptic number.

It is an amenable number.

43393305661 is a deficient number, since it is larger than the sum of its proper divisors (619839).

43393305661 is an equidigital number, since it uses as much as digits as its factorization.

43393305661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619838.

The product of its (nonzero) digits is 524880, while the sum is 43.

The spelling of 43393305661 in words is "forty-three billion, three hundred ninety-three million, three hundred five thousand, six hundred sixty-one".