660006511 has 4 divisors (see below), whose sum is σ = 662115472. Its totient is φ = 657897552.

The previous prime is 660006497. The next prime is 660006533. The reversal of 660006511 is 115600066.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 660006511 - 2¹³ = 659998319 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660006541) 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 in 3 ways as a sum of consecutive naturals, for example, 1054011 + ... + 1054636.

It is an arithmetic number, because the mean of its divisors is an integer number (165528868).

Almost surely, 2^660006511 is an apocalyptic number.

660006511 is a deficient number, since it is larger than the sum of its proper divisors (2108961).

660006511 is a wasteful number, since it uses less digits than its factorization.

660006511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2108960.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 660006511 is about 25690.5918771834. The cubic root of 660006511 is about 870.6616321682.

Adding to 660006511 its reverse (115600066), we get a palindrome (775606577).

The spelling of 660006511 in words is "six hundred sixty million, six thousand, five hundred eleven".