66853388786 has 4 divisors (see below), whose sum is σ = 100280083182. Its totient is φ = 33426694392.

The previous prime is 66853388783. The next prime is 66853388837. The reversal of 66853388786 is 68788335866.

66853388786 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 66734905561 + 118483225 = 258331^2 + 10885^2 .

It is not an unprimeable number, because it can be changed into a prime (66853388783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16713347195 + ... + 16713347198.

Almost surely, 2^66853388786 is an apocalyptic number.

66853388786 is a deficient number, since it is larger than the sum of its proper divisors (33426694396).

66853388786 is a wasteful number, since it uses less digits than its factorization.

66853388786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33426694395.

The product of its digits is 278691840, while the sum is 68.

The spelling of 66853388786 in words is "sixty-six billion, eight hundred fifty-three million, three hundred eighty-eight thousand, seven hundred eighty-six".