1665000002 has 16 divisors (see below), whose sum is σ = 2542155000. Its totient is φ = 817655040.

The previous prime is 1664999933. The next prime is 1665000017. The reversal of 1665000002 is 2000005661.

It can be written as a sum of positive squares in 4 ways, for example, as 907154161 + 757845841 = 30119^2 + 27529^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76874 + ... + 96122.

Almost surely, 2^1665000002 is an apocalyptic number.

1665000002 is a deficient number, since it is larger than the sum of its proper divisors (877154998).

1665000002 is a wasteful number, since it uses less digits than its factorization.

1665000002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20021.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1665000002 is about 40804.4115507135. The cubic root of 1665000002 is about 1185.2357597941.

Adding to 1665000002 its reverse (2000005661), we get a palindrome (3665005663).

The spelling of 1665000002 in words is "one billion, six hundred sixty-five million, two", and thus it is an aban number.