1303320665 has 16 divisors (see below), whose sum is σ = 1581449616. Its totient is φ = 1031040000.

The previous prime is 1303320647. The next prime is 1303320673. The reversal of 1303320665 is 5660233031.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 48177481 + 1255143184 = 6941^2 + 35428^2 .

It is not a de Polignac number, because 1303320665 - 2¹⁴ = 1303304281 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 722765 + ... + 724565.

It is an arithmetic number, because the mean of its divisors is an integer number (98840601).

Almost surely, 2^1303320665 is an apocalyptic number.

It is an amenable number.

1303320665 is a deficient number, since it is larger than the sum of its proper divisors (278128951).

1303320665 is a wasteful number, since it uses less digits than its factorization.

1303320665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3340.

The product of its (nonzero) digits is 9720, while the sum is 29.

The square root of 1303320665 is about 36101.5327236947. The cubic root of 1303320665 is about 1092.3213622220.

Adding to 1303320665 its reverse (5660233031), we get a palindrome (6963553696).

The spelling of 1303320665 in words is "one billion, three hundred three million, three hundred twenty thousand, six hundred sixty-five".