66713784219 has 32 divisors (see below), whose sum is σ = 104451782400. Its totient is φ = 41967072000.

The previous prime is 66713784191. The next prime is 66713784271. The reversal of 66713784219 is 91248731766.

It is not a de Polignac number, because 66713784219 - 2¹² = 66713780123 is a prime.

It is a super-3 number, since 3×66713784219³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (66713786219) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 130294 + ... + 387819.

It is an arithmetic number, because the mean of its divisors is an integer number (3264118200).

Almost surely, 2^66713784219 is an apocalyptic number.

66713784219 is a deficient number, since it is larger than the sum of its proper divisors (37737998181).

66713784219 is a wasteful number, since it uses less digits than its factorization.

66713784219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518392 (or 518386 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The spelling of 66713784219 in words is "sixty-six billion, seven hundred thirteen million, seven hundred eighty-four thousand, two hundred nineteen".