43091457665 has 4 divisors (see below), whose sum is σ = 51709749204. Its totient is φ = 34473166128.

The previous prime is 43091457641. The next prime is 43091457691. The reversal of 43091457665 is 56675419034.

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 14033482369 + 29057975296 = 118463^2 + 170464^2 .

It is a cyclic number.

It is not a de Polignac number, because 43091457665 - 2¹² = 43091453569 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4309145762 + ... + 4309145771.

It is an arithmetic number, because the mean of its divisors is an integer number (12927437301).

Almost surely, 2^43091457665 is an apocalyptic number.

It is an amenable number.

43091457665 is a deficient number, since it is larger than the sum of its proper divisors (8618291539).

43091457665 is an equidigital number, since it uses as much as digits as its factorization.

43091457665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8618291538.

The product of its (nonzero) digits is 2721600, while the sum is 50.

The spelling of 43091457665 in words is "forty-three billion, ninety-one million, four hundred fifty-seven thousand, six hundred sixty-five".