1005236665 has 4 divisors (see below), whose sum is σ = 1206284004. Its totient is φ = 804189328.

The previous prime is 1005236663. The next prime is 1005236699. The reversal of 1005236665 is 5666325001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 670602816 + 334633849 = 25896^2 + 18293^2 .

It is a cyclic number.

It is not a de Polignac number, because 1005236665 - 2¹ = 1005236663 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1005236665.

It is not an unprimeable number, because it can be changed into a prime (1005236663) 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 3 ways as a sum of consecutive naturals, for example, 100523662 + ... + 100523671.

It is an arithmetic number, because the mean of its divisors is an integer number (301571001).

Almost surely, 2^1005236665 is an apocalyptic number.

It is an amenable number.

1005236665 is a deficient number, since it is larger than the sum of its proper divisors (201047339).

1005236665 is an equidigital number, since it uses as much as digits as its factorization.

1005236665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201047338.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 1005236665 is about 31705.4674307130. The cubic root of 1005236665 is about 1001.7425168713.

The spelling of 1005236665 in words is "one billion, five million, two hundred thirty-six thousand, six hundred sixty-five".