665130365 has 4 divisors (see below), whose sum is σ = 798156444. Its totient is φ = 532104288.

The previous prime is 665130329. The next prime is 665130383. The reversal of 665130365 is 563031566.

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 484792324 + 180338041 = 22018^2 + 13429^2 .

It is a cyclic number.

It is not a de Polignac number, because 665130365 - 2¹⁸ = 664868221 is a prime.

It is a Duffinian number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 66513032 + ... + 66513041.

It is an arithmetic number, because the mean of its divisors is an integer number (199539111).

Almost surely, 2^665130365 is an apocalyptic number.

It is an amenable number.

665130365 is a deficient number, since it is larger than the sum of its proper divisors (133026079).

665130365 is a wasteful number, since it uses less digits than its factorization.

665130365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133026078.

The product of its (nonzero) digits is 48600, while the sum is 35.

The square root of 665130365 is about 25790.1214615209. The cubic root of 665130365 is about 872.9089070523.

The spelling of 665130365 in words is "six hundred sixty-five million, one hundred thirty thousand, three hundred sixty-five".