18544496414209 has 2 divisors, whose sum is σ = 18544496414210. Its totient is φ = 18544496414208.

The previous prime is 18544496414173. The next prime is 18544496414237. The reversal of 18544496414209 is 90241469444581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15211053018225 + 3333443395984 = 3900135^2 + 1825772^2 .

It is a cyclic number.

It is not a de Polignac number, because 18544496414209 - 2¹³ = 18544496406017 is a prime.

It is a super-2 number, since 2×18544496414209² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18544496412209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9272248207104 + 9272248207105.

It is an arithmetic number, because the mean of its divisors is an integer number (9272248207105).

Almost surely, 2^{18544496414209} is an apocalyptic number.

It is an amenable number.

18544496414209 is a deficient number, since it is larger than the sum of its proper divisors (1).

18544496414209 is an equidigital number, since it uses as much as digits as its factorization.

18544496414209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39813120, while the sum is 61.

The spelling of 18544496414209 in words is "eighteen trillion, five hundred forty-four billion, four hundred ninety-six million, four hundred fourteen thousand, two hundred nine".