123665143289 has 2 divisors, whose sum is σ = 123665143290. Its totient is φ = 123665143288.

The previous prime is 123665143229. The next prime is 123665143331. The reversal of 123665143289 is 982341566321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63403240000 + 60261903289 = 251800^2 + 245483^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123665143289 is a prime.

It is not a weakly prime, because it can be changed into another prime (123665143219) 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, 61832571644 + 61832571645.

It is an arithmetic number, because the mean of its divisors is an integer number (61832571645).

Almost surely, 2^123665143289 is an apocalyptic number.

It is an amenable number.

123665143289 is a deficient number, since it is larger than the sum of its proper divisors (1).

123665143289 is an equidigital number, since it uses as much as digits as its factorization.

123665143289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1866240, while the sum is 50.

The spelling of 123665143289 in words is "one hundred twenty-three billion, six hundred sixty-five million, one hundred forty-three thousand, two hundred eighty-nine".