1660006501 has 4 divisors (see below), whose sum is σ = 1662014592. Its totient is φ = 1657998412.

The previous prime is 1660006471. The next prime is 1660006511. The reversal of 1660006501 is 1056000661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1056000661 = 18233 ⋅57917.

It is a cyclic number.

It is not a de Polignac number, because 1660006501 - 2¹¹ = 1660004453 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 (1660006511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1002805 + ... + 1004458.

It is an arithmetic number, because the mean of its divisors is an integer number (415503648).

Almost surely, 2^1660006501 is an apocalyptic number.

It is an amenable number.

1660006501 is a deficient number, since it is larger than the sum of its proper divisors (2008091).

1660006501 is an equidigital number, since it uses as much as digits as its factorization.

1660006501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2008090.

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

The square root of 1660006501 is about 40743.1773552334. The cubic root of 1660006501 is about 1184.0496932230.

The spelling of 1660006501 in words is "one billion, six hundred sixty million, six thousand, five hundred one".