43318617457 has 4 divisors (see below), whose sum is σ = 43382604276. Its totient is φ = 43254630640.

The previous prime is 43318617451. The next prime is 43318617479. The reversal of 43318617457 is 75471681334.

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 38925711616 + 4392905841 = 197296^2 + 66279^2 .

It is a cyclic number.

It is not a de Polignac number, because 43318617457 - 2¹¹ = 43318615409 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 43318617457.

It is not an unprimeable number, because it can be changed into a prime (43318617451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31992394 + ... + 31993747.

It is an arithmetic number, because the mean of its divisors is an integer number (10845651069).

Almost surely, 2^43318617457 is an apocalyptic number.

It is an amenable number.

43318617457 is a deficient number, since it is larger than the sum of its proper divisors (63986819).

43318617457 is an equidigital number, since it uses as much as digits as its factorization.

43318617457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63986818.

The product of its digits is 1693440, while the sum is 49.

The spelling of 43318617457 in words is "forty-three billion, three hundred eighteen million, six hundred seventeen thousand, four hundred fifty-seven".