18687177318343 has 2 divisors, whose sum is σ = 18687177318344. Its totient is φ = 18687177318342.

The previous prime is 18687177318323. The next prime is 18687177318371. The reversal of 18687177318343 is 34381377178681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18687177318343 - 2¹⁷ = 18687177187271 is a prime.

It is a super-2 number, since 2×18687177318343² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18687177318323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9343588659171 + 9343588659172.

It is an arithmetic number, because the mean of its divisors is an integer number (9343588659172).

Almost surely, 2^{18687177318343} is an apocalyptic number.

18687177318343 is a deficient number, since it is larger than the sum of its proper divisors (1).

18687177318343 is an equidigital number, since it uses as much as digits as its factorization.

18687177318343 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 113799168, while the sum is 67.

The spelling of 18687177318343 in words is "eighteen trillion, six hundred eighty-seven billion, one hundred seventy-seven million, three hundred eighteen thousand, three hundred forty-three".