1006005021665 has 16 divisors (see below), whose sum is σ = 1380521573760. Its totient is φ = 689403242880.

The previous prime is 1006005021647. The next prime is 1006005021667. The reversal of 1006005021665 is 5661205006001.

It is not a de Polignac number, because 1006005021665 - 2¹⁰ = 1006005020641 is a prime.

It is a super-2 number, since 2×1006005021665² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1006005021667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8875631 + ... + 8988260.

It is an arithmetic number, because the mean of its divisors is an integer number (86282598360).

Almost surely, 2^{1006005021665} is an apocalyptic number.

It is an amenable number.

1006005021665 is a deficient number, since it is larger than the sum of its proper divisors (374516552095).

1006005021665 is a wasteful number, since it uses less digits than its factorization.

1006005021665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17865512.

The product of its (nonzero) digits is 10800, while the sum is 32.

The spelling of 1006005021665 in words is "one trillion, six billion, five million, twenty-one thousand, six hundred sixty-five".