201329665 has 4 divisors (see below), whose sum is σ = 241595604. Its totient is φ = 161063728.

The previous prime is 201329651. The next prime is 201329729. The reversal of 201329665 is 566923102.

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 41357761 + 159971904 = 6431^2 + 12648^2 .

It is a cyclic number.

It is not a de Polignac number, because 201329665 - 2⁵ = 201329633 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201329665.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20132962 + ... + 20132971.

It is an arithmetic number, because the mean of its divisors is an integer number (60398901).

Almost surely, 2^201329665 is an apocalyptic number.

It is an amenable number.

201329665 is a deficient number, since it is larger than the sum of its proper divisors (40265939).

201329665 is an equidigital number, since it uses as much as digits as its factorization.

201329665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40265938.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 201329665 is about 14189.0685036052. The cubic root of 201329665 is about 586.0966741692.

The spelling of 201329665 in words is "two hundred one million, three hundred twenty-nine thousand, six hundred sixty-five".