19660006690 has 8 divisors (see below), whose sum is σ = 35388012060. Its totient is φ = 7864002672.

The previous prime is 19660006679. The next prime is 19660006739. The reversal of 19660006690 is 9660006691.

It can be written as a sum of positive squares in 2 ways, for example, as 17986296769 + 1673709921 = 134113^2 + 40911^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×19660006690² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 983000325 + ... + 983000344.

Almost surely, 2^19660006690 is an apocalyptic number.

19660006690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19660006690 is a deficient number, since it is larger than the sum of its proper divisors (15728005370).

19660006690 is a wasteful number, since it uses less digits than its factorization.

19660006690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1966000676.

The product of its (nonzero) digits is 104976, while the sum is 43.

Subtracting from 19660006690 its reverse (9660006691), we obtain a palindrome (9999999999).

The spelling of 19660006690 in words is "nineteen billion, six hundred sixty million, six thousand, six hundred ninety".