43581178704461 has 2 divisors, whose sum is σ = 43581178704462. Its totient is φ = 43581178704460.

The previous prime is 43581178704421. The next prime is 43581178704521. The reversal of 43581178704461 is 16440787118534.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33498686718025 + 10082491986436 = 5787805^2 + 3175294^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43581178704461 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43581178704461.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43581178704421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21790589352230 + 21790589352231.

It is an arithmetic number, because the mean of its divisors is an integer number (21790589352231).

Almost surely, 2^{43581178704461} is an apocalyptic number.

It is an amenable number.

43581178704461 is a deficient number, since it is larger than the sum of its proper divisors (1).

43581178704461 is an equidigital number, since it uses as much as digits as its factorization.

43581178704461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18063360, while the sum is 59.

The spelling of 43581178704461 in words is "forty-three trillion, five hundred eighty-one billion, one hundred seventy-eight million, seven hundred four thousand, four hundred sixty-one".