18701717053561 has 2 divisors, whose sum is σ = 18701717053562. Its totient is φ = 18701717053560.

The previous prime is 18701717053541. The next prime is 18701717053577. The reversal of 18701717053561 is 16535071710781.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18685735290000 + 15981763561 = 4322700^2 + 126419^2 .

It is a cyclic number.

It is not a de Polignac number, because 18701717053561 - 2¹⁷ = 18701716922489 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18701717053499 and 18701717053508.

It is not a weakly prime, because it can be changed into another prime (18701717053531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9350858526780 + 9350858526781.

It is an arithmetic number, because the mean of its divisors is an integer number (9350858526781).

Almost surely, 2^{18701717053561} is an apocalyptic number.

It is an amenable number.

18701717053561 is a deficient number, since it is larger than the sum of its proper divisors (1).

18701717053561 is an equidigital number, since it uses as much as digits as its factorization.

18701717053561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1234800, while the sum is 52.

The spelling of 18701717053561 in words is "eighteen trillion, seven hundred one billion, seven hundred seventeen million, fifty-three thousand, five hundred sixty-one".