663665013 has 12 divisors (see below), whose sum is σ = 1045775328. Its totient is φ = 402221160.

The previous prime is 663665011. The next prime is 663665021. The reversal of 663665013 is 310566366.

It is a happy number.

663665013 is a `hidden beast` number, since 6 + 636 + 6 + 5 + 0 + 13 = 666.

It is not a de Polignac number, because 663665013 - 2¹ = 663665011 is a prime.

It is a super-5 number, since 5×663665013⁵ (a number of 45 digits) contains 55555 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663665011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3351745 + ... + 3351942.

It is an arithmetic number, because the mean of its divisors is an integer number (87147944).

Almost surely, 2^663665013 is an apocalyptic number.

It is an amenable number.

663665013 is a deficient number, since it is larger than the sum of its proper divisors (382110315).

663665013 is a wasteful number, since it uses less digits than its factorization.

663665013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6703704 (or 6703701 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 36.

The square root of 663665013 is about 25761.6966250284. The cubic root of 663665013 is about 872.2673990733.

The spelling of 663665013 in words is "six hundred sixty-three million, six hundred sixty-five thousand, thirteen".