663706009 has 4 divisors (see below), whose sum is σ = 692562816. Its totient is φ = 634849204.

The previous prime is 663706007. The next prime is 663706051. The reversal of 663706009 is 900607366.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 663706009 - 2¹ = 663706007 is a prime.

It is a super-3 number, since 3×663706009³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663706003) by changing a digit.

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, 14428369 + ... + 14428414.

It is an arithmetic number, because the mean of its divisors is an integer number (173140704).

Almost surely, 2^663706009 is an apocalyptic number.

It is an amenable number.

663706009 is a deficient number, since it is larger than the sum of its proper divisors (28856807).

663706009 is a wasteful number, since it uses less digits than its factorization.

663706009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28856806.

The product of its (nonzero) digits is 40824, while the sum is 37.

The square root of 663706009 is about 25762.4922901493. The cubic root of 663706009 is about 872.2853593080.

The spelling of 663706009 in words is "six hundred sixty-three million, seven hundred six thousand, nine".