18814407889217 has 2 divisors, whose sum is σ = 18814407889218. Its totient is φ = 18814407889216.

The previous prime is 18814407889171. The next prime is 18814407889261. The reversal of 18814407889217 is 71298870441881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11679504465841 + 7134903423376 = 3417529^2 + 2671124^2 .

It is a cyclic number.

It is not a de Polignac number, because 18814407889217 - 2³⁸ = 18539529982273 is a prime.

It is not a weakly prime, because it can be changed into another prime (18814407889267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9407203944608 + 9407203944609.

It is an arithmetic number, because the mean of its divisors is an integer number (9407203944609).

Almost surely, 2^{18814407889217} is an apocalyptic number.

It is an amenable number.

18814407889217 is a deficient number, since it is larger than the sum of its proper divisors (1).

18814407889217 is an equidigital number, since it uses as much as digits as its factorization.

18814407889217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57802752, while the sum is 68.

The spelling of 18814407889217 in words is "eighteen trillion, eight hundred fourteen billion, four hundred seven million, eight hundred eighty-nine thousand, two hundred seventeen".