18875747761993 has 2 divisors, whose sum is σ = 18875747761994. Its totient is φ = 18875747761992.

The previous prime is 18875747761987. The next prime is 18875747762149. The reversal of 18875747761993 is 39916774757881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15895953702729 + 2979794059264 = 3986973^2 + 1726208^2 .

It is a cyclic number.

It is not a de Polignac number, because 18875747761993 - 2¹⁷ = 18875747630921 is a prime.

It is not a weakly prime, because it can be changed into another prime (18875747761943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9437873880996 + 9437873880997.

It is an arithmetic number, because the mean of its divisors is an integer number (9437873880997).

Almost surely, 2^{18875747761993} is an apocalyptic number.

It is an amenable number.

18875747761993 is a deficient number, since it is larger than the sum of its proper divisors (1).

18875747761993 is an equidigital number, since it uses as much as digits as its factorization.

18875747761993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4480842240, while the sum is 82.

The spelling of 18875747761993 in words is "eighteen trillion, eight hundred seventy-five billion, seven hundred forty-seven million, seven hundred sixty-one thousand, nine hundred ninety-three".