18788643282061 has 2 divisors, whose sum is σ = 18788643282062. Its totient is φ = 18788643282060.

The previous prime is 18788643282007. The next prime is 18788643282083. The reversal of 18788643282061 is 16028234688781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17820800517961 + 967842764100 = 4221469^2 + 983790^2 .

It is a cyclic number.

It is not a de Polignac number, because 18788643282061 - 2¹⁵ = 18788643249293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18788643281984 and 18788643282002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18788643282001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9394321641030 + 9394321641031.

It is an arithmetic number, because the mean of its divisors is an integer number (9394321641031).

Almost surely, 2^{18788643282061} is an apocalyptic number.

It is an amenable number.

18788643282061 is a deficient number, since it is larger than the sum of its proper divisors (1).

18788643282061 is an equidigital number, since it uses as much as digits as its factorization.

18788643282061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 49545216, while the sum is 64.

The spelling of 18788643282061 in words is "eighteen trillion, seven hundred eighty-eight billion, six hundred forty-three million, two hundred eighty-two thousand, sixty-one".