1329668765 has 4 divisors (see below), whose sum is σ = 1595602524. Its totient is φ = 1063735008.

The previous prime is 1329668749. The next prime is 1329668803. The reversal of 1329668765 is 5678669231.

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 865654084 + 464014681 = 29422^2 + 21541^2 .

It is a cyclic number.

It is not a de Polignac number, because 1329668765 - 2⁴ = 1329668749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132966872 + ... + 132966881.

It is an arithmetic number, because the mean of its divisors is an integer number (398900631).

Almost surely, 2^1329668765 is an apocalyptic number.

It is an amenable number.

1329668765 is a deficient number, since it is larger than the sum of its proper divisors (265933759).

1329668765 is an equidigital number, since it uses as much as digits as its factorization.

1329668765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265933758.

The product of its digits is 3265920, while the sum is 53.

The square root of 1329668765 is about 36464.6234726207. The cubic root of 1329668765 is about 1099.6331462617.

The spelling of 1329668765 in words is "one billion, three hundred twenty-nine million, six hundred sixty-eight thousand, seven hundred sixty-five".