18056043457 has 2 divisors, whose sum is σ = 18056043458. Its totient is φ = 18056043456.

The previous prime is 18056043449. The next prime is 18056043559. The reversal of 18056043457 is 75434065081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15304411521 + 2751631936 = 123711^2 + 52456^2 .

It is an emirp because it is prime and its reverse (75434065081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18056043457 - 2³ = 18056043449 is a prime.

It is not a weakly prime, because it can be changed into another prime (18056043437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9028021728 + 9028021729.

It is an arithmetic number, because the mean of its divisors is an integer number (9028021729).

Almost surely, 2^18056043457 is an apocalyptic number.

It is an amenable number.

18056043457 is a deficient number, since it is larger than the sum of its proper divisors (1).

18056043457 is an equidigital number, since it uses as much as digits as its factorization.

18056043457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 403200, while the sum is 43.

The spelling of 18056043457 in words is "eighteen billion, fifty-six million, forty-three thousand, four hundred fifty-seven".