66684145213 has 4 divisors (see below), whose sum is σ = 76210451680. Its totient is φ = 57157838748.

The previous prime is 66684145211. The next prime is 66684145219. The reversal of 66684145213 is 31254148666.

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 66684145213 - 2¹ = 66684145211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66684145211) 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, 4763153223 + ... + 4763153236.

It is an arithmetic number, because the mean of its divisors is an integer number (19052612920).

Almost surely, 2^66684145213 is an apocalyptic number.

It is an amenable number.

66684145213 is a deficient number, since it is larger than the sum of its proper divisors (9526306467).

66684145213 is an equidigital number, since it uses as much as digits as its factorization.

66684145213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9526306466.

The product of its digits is 829440, while the sum is 46.

The spelling of 66684145213 in words is "sixty-six billion, six hundred eighty-four million, one hundred forty-five thousand, two hundred thirteen".