1660288275209 has 2 divisors, whose sum is σ = 1660288275210. Its totient is φ = 1660288275208.

The previous prime is 1660288275203. The next prime is 1660288275253. The reversal of 1660288275209 is 9025728820661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1363756840000 + 296531435209 = 1167800^2 + 544547^2 .

It is a cyclic number.

It is not a de Polignac number, because 1660288275209 - 2²⁴ = 1660271497993 is a prime.

It is a super-2 number, since 2×1660288275209² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1660288275203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830144137604 + 830144137605.

It is an arithmetic number, because the mean of its divisors is an integer number (830144137605).

Almost surely, 2^{1660288275209} is an apocalyptic number.

It is an amenable number.

1660288275209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660288275209 is an equidigital number, since it uses as much as digits as its factorization.

1660288275209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5806080, while the sum is 56.

The spelling of 1660288275209 in words is "one trillion, six hundred sixty billion, two hundred eighty-eight million, two hundred seventy-five thousand, two hundred nine".