1000066665 has 32 divisors (see below), whose sum is σ = 1778789376. Its totient is φ = 476455680.

The previous prime is 1000066663. The next prime is 1000066679. The reversal of 1000066665 is 5666600001.

It is not a de Polignac number, because 1000066665 - 2¹ = 1000066663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1000066663) 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 31 ways as a sum of consecutive naturals, for example, 76674 + ... + 88763.

It is an arithmetic number, because the mean of its divisors is an integer number (55587168).

Almost surely, 2^1000066665 is an apocalyptic number.

1000066665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1000066665 is a deficient number, since it is larger than the sum of its proper divisors (778722711).

1000066665 is a wasteful number, since it uses less digits than its factorization.

1000066665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165489.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 1000066665 is about 31623.8306503181. The cubic root of 1000066665 is about 1000.0222211729.

Adding to 1000066665 its reverse (5666600001), we get a palindrome (6666666666).

The spelling of 1000066665 in words is "one billion, sixty-six thousand, six hundred sixty-five".