18240344277137 has 2 divisors, whose sum is σ = 18240344277138. Its totient is φ = 18240344277136.

The previous prime is 18240344277091. The next prime is 18240344277149. The reversal of 18240344277137 is 73177244304281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10187229761536 + 8053114515601 = 3191744^2 + 2837801^2 .

It is a cyclic number.

It is not a de Polignac number, because 18240344277137 - 2³⁴ = 18223164407953 is a prime.

It is not a weakly prime, because it can be changed into another prime (18240344277167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9120172138568 + 9120172138569.

It is an arithmetic number, because the mean of its divisors is an integer number (9120172138569).

Almost surely, 2^{18240344277137} is an apocalyptic number.

It is an amenable number.

18240344277137 is a deficient number, since it is larger than the sum of its proper divisors (1).

18240344277137 is an equidigital number, since it uses as much as digits as its factorization.

18240344277137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6322176, while the sum is 53.

The spelling of 18240344277137 in words is "eighteen trillion, two hundred forty billion, three hundred forty-four million, two hundred seventy-seven thousand, one hundred thirty-seven".