1329726665 has 8 divisors (see below), whose sum is σ = 1596133248. Its totient is φ = 1063473840.

The previous prime is 1329726659. The next prime is 1329726667. The reversal of 1329726665 is 5666279231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1329726665 - 2¹⁴ = 1329710281 is a prime.

It is a super-2 number, since 2×1329726665² = 3536346007224044450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1329726667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18467 + ... + 54776.

It is an arithmetic number, because the mean of its divisors is an integer number (199516656).

Almost surely, 2^1329726665 is an apocalyptic number.

It is an amenable number.

1329726665 is a deficient number, since it is larger than the sum of its proper divisors (266406583).

1329726665 is an equidigital number, since it uses as much as digits as its factorization.

1329726665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76879.

The product of its digits is 816480, while the sum is 47.

The square root of 1329726665 is about 36465.4173841463. The cubic root of 1329726665 is about 1099.6491070876.

The spelling of 1329726665 in words is "one billion, three hundred twenty-nine million, seven hundred twenty-six thousand, six hundred sixty-five".