665613263 has 8 divisors (see below), whose sum is σ = 800737920. Its totient is φ = 540497880.

The previous prime is 665613251. The next prime is 665613269. The reversal of 665613263 is 362316566.

It is a happy number.

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 665613263 - 2¹⁴ = 665596879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665613269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2502173 + ... + 2502438.

It is an arithmetic number, because the mean of its divisors is an integer number (100092240).

Almost surely, 2^665613263 is an apocalyptic number.

665613263 is a deficient number, since it is larger than the sum of its proper divisors (135124657).

665613263 is a wasteful number, since it uses less digits than its factorization.

665613263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5004637.

The product of its digits is 116640, while the sum is 38.

The square root of 665613263 is about 25799.4818358819. The cubic root of 665613263 is about 873.1201057468.

The spelling of 665613263 in words is "six hundred sixty-five million, six hundred thirteen thousand, two hundred sixty-three".