16660006997 has 2 divisors, whose sum is σ = 16660006998. Its totient is φ = 16660006996.

The previous prime is 16660006991. The next prime is 16660007053. The reversal of 16660006997 is 79960006661.

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., 16575532516 + 84474481 = 128746^2 + 9191^2 .

It is a cyclic number.

It is not a de Polignac number, because 16660006997 - 2⁴ = 16660006981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16660006991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8330003498 + 8330003499.

It is an arithmetic number, because the mean of its divisors is an integer number (8330003499).

Almost surely, 2^16660006997 is an apocalyptic number.

It is an amenable number.

16660006997 is a deficient number, since it is larger than the sum of its proper divisors (1).

16660006997 is an equidigital number, since it uses as much as digits as its factorization.

16660006997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 734832, while the sum is 50.

The spelling of 16660006997 in words is "sixteen billion, six hundred sixty million, six thousand, nine hundred ninety-seven".