1001666065 has 8 divisors (see below), whose sum is σ = 1202444928. Its totient is φ = 801035760.

The previous prime is 1001666063. The next prime is 1001666087. The reversal of 1001666065 is 5606661001.

1001666065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 1001666065 - 2¹ = 1001666063 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001666063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21721 + ... + 49750.

It is an arithmetic number, because the mean of its divisors is an integer number (150305616).

Almost surely, 2^1001666065 is an apocalyptic number.

It is an amenable number.

1001666065 is a deficient number, since it is larger than the sum of its proper divisors (200778863).

1001666065 is an equidigital number, since it uses as much as digits as its factorization.

1001666065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74279.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 1001666065 is about 31649.1084392594. The cubic root of 1001666065 is about 1000.5550468660. Note that the first 3 decimals are identical.

The spelling of 1001666065 in words is "one billion, one million, six hundred sixty-six thousand, sixty-five".