1325201665 has 8 divisors (see below), whose sum is σ = 1620246888. Its totient is φ = 1040158080.

The previous prime is 1325201659. The next prime is 1325201677. The reversal of 1325201665 is 5661025231.

It can be written as a sum of positive squares in 4 ways, for example, as 560789761 + 764411904 = 23681^2 + 27648^2 .

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

It is not a de Polignac number, because 1325201665 - 2¹³ = 1325193473 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2500116 + ... + 2500645.

It is an arithmetic number, because the mean of its divisors is an integer number (202530861).

Almost surely, 2^1325201665 is an apocalyptic number.

It is an amenable number.

1325201665 is a deficient number, since it is larger than the sum of its proper divisors (295045223).

1325201665 is an equidigital number, since it uses as much as digits as its factorization.

1325201665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5000819.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 1325201665 is about 36403.3194228219. The cubic root of 1325201665 is about 1098.4003373707.

Adding to 1325201665 its reverse (5661025231), we get a palindrome (6986226896).

The spelling of 1325201665 in words is "one billion, three hundred twenty-five million, two hundred one thousand, six hundred sixty-five".