18069001661 has 2 divisors, whose sum is σ = 18069001662. Its totient is φ = 18069001660.

The previous prime is 18069001649. The next prime is 18069001777. The reversal of 18069001661 is 16610096081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16076718436 + 1992283225 = 126794^2 + 44635^2 .

It is a cyclic number.

It is not a de Polignac number, because 18069001661 - 2¹⁰ = 18069000637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18069001631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9034500830 + 9034500831.

It is an arithmetic number, because the mean of its divisors is an integer number (9034500831).

Almost surely, 2^18069001661 is an apocalyptic number.

It is an amenable number.

18069001661 is a deficient number, since it is larger than the sum of its proper divisors (1).

18069001661 is an equidigital number, since it uses as much as digits as its factorization.

18069001661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 38.

The spelling of 18069001661 in words is "eighteen billion, sixty-nine million, one thousand, six hundred sixty-one".