66833633866 has 4 divisors (see below), whose sum is σ = 100250450802. Its totient is φ = 33416816932.

The previous prime is 66833633861. The next prime is 66833633899.

66833633866 is nontrivially palindromic in base 10.

66833633866 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., 54240081025 + 12593552841 = 232895^2 + 112221^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66833633866.

It is not an unprimeable number, because it can be changed into a prime (66833633861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16708408465 + ... + 16708408468.

Almost surely, 2^66833633866 is an apocalyptic number.

66833633866 is a deficient number, since it is larger than the sum of its proper divisors (33416816936).

66833633866 is a wasteful number, since it uses less digits than its factorization.

66833633866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33416816935.

The product of its digits is 40310784, while the sum is 58.

The spelling of 66833633866 in words is "sixty-six billion, eight hundred thirty-three million, six hundred thirty-three thousand, eight hundred sixty-six".