1660807009 has 9 divisors (see below), whose sum is σ = 1684488529. Its totient is φ = 1637455540.

The previous prime is 1660806997. The next prime is 1660807019. The reversal of 1660807009 is 9007080661.

The square root of 1660807009 is 40753.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 1660807009 - 2¹⁷ = 1660675937 is a prime.

It is a super-2 number, since 2×1660807009² = 5516559842287052162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1660807019) 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 8 ways as a sum of consecutive naturals, for example, 3382254 + ... + 3382744.

Almost surely, 2^1660807009 is an apocalyptic number.

1660807009 is the 40753-rd square number.

1660807009 is the 20377-th centered octagonal number.

It is an amenable number.

1660807009 is a deficient number, since it is larger than the sum of its proper divisors (23681520).

1660807009 is an frugal number, since it uses more digits than its factorization.

1660807009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1148 (or 574 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 37.

The cubic root of 1660807009 is about 1184.2399914603.

The spelling of 1660807009 in words is "one billion, six hundred sixty million, eight hundred seven thousand, nine".