666656631203013 has 24 divisors (see below), whose sum is σ = 1050607710206496. Its totient is φ = 403988755341600.

The previous prime is 666656631203011. The next prime is 666656631203051. The reversal of 666656631203013 is 310302136656666.

It is not a de Polignac number, because 666656631203013 - 2¹ = 666656631203011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666656631203011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 378839398 + ... + 380595063.

It is an arithmetic number, because the mean of its divisors is an integer number (43775321258604).

Almost surely, 2^{666656631203013} is an apocalyptic number.

It is an amenable number.

666656631203013 is a deficient number, since it is larger than the sum of its proper divisors (383951079003483).

666656631203013 is a wasteful number, since it uses less digits than its factorization.

666656631203013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759443345 (or 759443342 counting only the distinct ones).

The product of its (nonzero) digits is 12597120, while the sum is 54.

Adding to 666656631203013 its reverse (310302136656666), we get a palindrome (976958767859679).

The spelling of 666656631203013 in words is "six hundred sixty-six trillion, six hundred fifty-six billion, six hundred thirty-one million, two hundred three thousand, thirteen".