665516365 has 8 divisors (see below), whose sum is σ = 802108440. Its totient is φ = 530087232.

The previous prime is 665516351. The next prime is 665516377. The reversal of 665516365 is 563615566.

It can be written as a sum of positive squares in 4 ways, for example, as 417548356 + 247968009 = 20434^2 + 15747^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 665516365 - 2⁹ = 665515853 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 289474 + ... + 291763.

It is an arithmetic number, because the mean of its divisors is an integer number (100263555).

Almost surely, 2^665516365 is an apocalyptic number.

It is an amenable number.

665516365 is a deficient number, since it is larger than the sum of its proper divisors (136592075).

665516365 is a wasteful number, since it uses less digits than its factorization.

665516365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581471.

The product of its digits is 486000, while the sum is 43.

The square root of 665516365 is about 25797.6038615992. The cubic root of 665516365 is about 873.0777349476.

The spelling of 665516365 in words is "six hundred sixty-five million, five hundred sixteen thousand, three hundred sixty-five".