18745670717 has 2 divisors, whose sum is σ = 18745670718. Its totient is φ = 18745670716.

The previous prime is 18745670663. The next prime is 18745670729. The reversal of 18745670717 is 71707654781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18741883801 + 3786916 = 136901^2 + 1946^2 .

It is a cyclic number.

It is not a de Polignac number, because 18745670717 - 2¹⁸ = 18745408573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18745670737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9372835358 + 9372835359.

It is an arithmetic number, because the mean of its divisors is an integer number (9372835359).

Almost surely, 2^18745670717 is an apocalyptic number.

It is an amenable number.

18745670717 is a deficient number, since it is larger than the sum of its proper divisors (1).

18745670717 is an equidigital number, since it uses as much as digits as its factorization.

18745670717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304960, while the sum is 53.

The spelling of 18745670717 in words is "eighteen billion, seven hundred forty-five million, six hundred seventy thousand, seven hundred seventeen".