18317643704641 has 2 divisors, whose sum is σ = 18317643704642. Its totient is φ = 18317643704640.

The previous prime is 18317643704629. The next prime is 18317643704743. The reversal of 18317643704641 is 14640734671381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16037782278400 + 2279861426241 = 4004720^2 + 1509921^2 .

It is a cyclic number.

It is not a de Polignac number, because 18317643704641 - 2¹⁷ = 18317643573569 is a prime.

It is not a weakly prime, because it can be changed into another prime (18317643704441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9158821852320 + 9158821852321.

It is an arithmetic number, because the mean of its divisors is an integer number (9158821852321).

Almost surely, 2^{18317643704641} is an apocalyptic number.

It is an amenable number.

18317643704641 is a deficient number, since it is larger than the sum of its proper divisors (1).

18317643704641 is an equidigital number, since it uses as much as digits as its factorization.

18317643704641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8128512, while the sum is 55.

The spelling of 18317643704641 in words is "eighteen trillion, three hundred seventeen billion, six hundred forty-three million, seven hundred four thousand, six hundred forty-one".