66783673213 has 4 divisors (see below), whose sum is σ = 67019658208. Its totient is φ = 66547688220.

The previous prime is 66783673193. The next prime is 66783673219. The reversal of 66783673213 is 31237638766.

It is a happy number.

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 66783673213 - 2²⁵ = 66750118781 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 (66783673219) 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, 117992073 + ... + 117992638.

It is an arithmetic number, because the mean of its divisors is an integer number (16754914552).

Almost surely, 2^66783673213 is an apocalyptic number.

It is an amenable number.

66783673213 is a deficient number, since it is larger than the sum of its proper divisors (235984995).

66783673213 is a wasteful number, since it uses less digits than its factorization.

66783673213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235984994.

The product of its digits is 4572288, while the sum is 52.

The spelling of 66783673213 in words is "sixty-six billion, seven hundred eighty-three million, six hundred seventy-three thousand, two hundred thirteen".