18686662069 has 2 divisors, whose sum is σ = 18686662070. Its totient is φ = 18686662068.

The previous prime is 18686662067. The next prime is 18686662073. The reversal of 18686662069 is 96026668681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17539823844 + 1146838225 = 132438^2 + 33865^2 .

It is a cyclic number.

It is not a de Polignac number, because 18686662069 - 2¹ = 18686662067 is a prime.

It is a super-2 number, since 2×18686662069² (a number of 21 digits) contains 22 as substring.

Together with 18686662067, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18686662067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9343331034 + 9343331035.

It is an arithmetic number, because the mean of its divisors is an integer number (9343331035).

Almost surely, 2^18686662069 is an apocalyptic number.

It is an amenable number.

18686662069 is a deficient number, since it is larger than the sum of its proper divisors (1).

18686662069 is an equidigital number, since it uses as much as digits as its factorization.

18686662069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8957952, while the sum is 58.

The spelling of 18686662069 in words is "eighteen billion, six hundred eighty-six million, six hundred sixty-two thousand, sixty-nine".