1660006709 has 2 divisors, whose sum is σ = 1660006710. Its totient is φ = 1660006708.

The previous prime is 1660006651. The next prime is 1660006721. The reversal of 1660006709 is 9076000661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1631352100 + 28654609 = 40390^2 + 5353^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1660006709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1660006759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830003354 + 830003355.

It is an arithmetic number, because the mean of its divisors is an integer number (830003355).

Almost surely, 2^1660006709 is an apocalyptic number.

It is an amenable number.

1660006709 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660006709 is an equidigital number, since it uses as much as digits as its factorization.

1660006709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 1660006709 is about 40743.1799078079. The cubic root of 1660006709 is about 1184.0497426771.

The spelling of 1660006709 in words is "one billion, six hundred sixty million, six thousand, seven hundred nine".