43159388161 has 4 divisors (see below), whose sum is σ = 43176035332. Its totient is φ = 43142740992.

The previous prime is 43159388159. The next prime is 43159388177. The reversal of 43159388161 is 16188395134.

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 16941625600 + 26217762561 = 130160^2 + 161919^2 .

It is a cyclic number.

It is not a de Polignac number, because 43159388161 - 2¹ = 43159388159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43159388131) 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, 8319696 + ... + 8324881.

It is an arithmetic number, because the mean of its divisors is an integer number (10794008833).

It is a Proth number, since it is equal to 5145 ⋅ 2²³ + 1 and 5145 < 2²³.

Almost surely, 2^43159388161 is an apocalyptic number.

It is an amenable number.

43159388161 is a deficient number, since it is larger than the sum of its proper divisors (16647171).

43159388161 is a wasteful number, since it uses less digits than its factorization.

43159388161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16647170.

The product of its digits is 622080, while the sum is 49.

The spelling of 43159388161 in words is "forty-three billion, one hundred fifty-nine million, three hundred eighty-eight thousand, one hundred sixty-one".