18657851242741 has 2 divisors, whose sum is σ = 18657851242742. Its totient is φ = 18657851242740.

The previous prime is 18657851242727. The next prime is 18657851242783. The reversal of 18657851242741 is 14724215875681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10812614368516 + 7845236874225 = 3288254^2 + 2800935^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18657851242741 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18657851242741.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18657851242721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9328925621370 + 9328925621371.

It is an arithmetic number, because the mean of its divisors is an integer number (9328925621371).

Almost surely, 2^{18657851242741} is an apocalyptic number.

It is an amenable number.

18657851242741 is a deficient number, since it is larger than the sum of its proper divisors (1).

18657851242741 is an equidigital number, since it uses as much as digits as its factorization.

18657851242741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30105600, while the sum is 61.

The spelling of 18657851242741 in words is "eighteen trillion, six hundred fifty-seven billion, eight hundred fifty-one million, two hundred forty-two thousand, seven hundred forty-one".