18044040257 has 2 divisors, whose sum is σ = 18044040258. Its totient is φ = 18044040256.

The previous prime is 18044040191. The next prime is 18044040281. The reversal of 18044040257 is 75204044081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13850700721 + 4193339536 = 117689^2 + 64756^2 .

It is a cyclic number.

It is not a de Polignac number, because 18044040257 - 2¹⁸ = 18043778113 is a prime.

It is not a weakly prime, because it can be changed into another prime (18044040457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9022020128 + 9022020129.

It is an arithmetic number, because the mean of its divisors is an integer number (9022020129).

Almost surely, 2^18044040257 is an apocalyptic number.

It is an amenable number.

18044040257 is a deficient number, since it is larger than the sum of its proper divisors (1).

18044040257 is an equidigital number, since it uses as much as digits as its factorization.

18044040257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35840, while the sum is 35.

The spelling of 18044040257 in words is "eighteen billion, forty-four million, forty thousand, two hundred fifty-seven".