666668513013 has 4 divisors (see below), whose sum is σ = 888891350688. Its totient is φ = 444445675340.

The previous prime is 666668512969. The next prime is 666668513041. The reversal of 666668513013 is 310315866666.

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 666668513013 - 2¹⁸ = 666668250869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666668511013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111111418833 + ... + 111111418838.

It is an arithmetic number, because the mean of its divisors is an integer number (222222837672).

Almost surely, 2^666668513013 is an apocalyptic number.

It is an amenable number.

666668513013 is a deficient number, since it is larger than the sum of its proper divisors (222222837675).

666668513013 is a wasteful number, since it uses less digits than its factorization.

666668513013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222222837674.

The product of its (nonzero) digits is 2799360, while the sum is 51.

The spelling of 666668513013 in words is "six hundred sixty-six billion, six hundred sixty-eight million, five hundred thirteen thousand, thirteen".