665606063 has 4 divisors (see below), whose sum is σ = 666020328. Its totient is φ = 665191800.

The previous prime is 665606033. The next prime is 665606069. The reversal of 665606063 is 360606566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 665606063 - 2⁸ = 665605807 is a prime.

It is a super-2 number, since 2×665606063² = 886062862204719938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665606069) 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 3 ways as a sum of consecutive naturals, for example, 204713 + ... + 207938.

It is an arithmetic number, because the mean of its divisors is an integer number (166505082).

Almost surely, 2^665606063 is an apocalyptic number.

665606063 is a deficient number, since it is larger than the sum of its proper divisors (414265).

665606063 is a wasteful number, since it uses less digits than its factorization.

665606063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414264.

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

The square root of 665606063 is about 25799.3422978184. The cubic root of 665606063 is about 873.1169575286.

The spelling of 665606063 in words is "six hundred sixty-five million, six hundred six thousand, sixty-three".