1016661009 has 16 divisors (see below), whose sum is σ = 1668367232. Its totient is φ = 536260608.

The previous prime is 1016660989. The next prime is 1016661043. The reversal of 1016661009 is 9001666101.

It is a happy number.

It is not a de Polignac number, because 1016661009 - 2⁹ = 1016660497 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1016661049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1861744 + ... + 1862289.

It is an arithmetic number, because the mean of its divisors is an integer number (104272952).

Almost surely, 2^1016661009 is an apocalyptic number.

It is an amenable number.

1016661009 is a deficient number, since it is larger than the sum of its proper divisors (651706223).

1016661009 is a wasteful number, since it uses less digits than its factorization.

1016661009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3724056.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 1016661009 is about 31885.1220634327. The cubic root of 1016661009 is about 1005.5231087758.

The spelling of 1016661009 in words is "one billion, sixteen million, six hundred sixty-one thousand, nine".