66820802866 has 8 divisors (see below), whose sum is σ = 100232992044. Its totient is φ = 33409805520.

The previous prime is 66820802863. The next prime is 66820802869.

66820802866 is nontrivially palindromic in base 10.

66820802866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (66820802863) and next prime (66820802869).

It can be written as a sum of positive squares in 2 ways, for example, as 62868040225 + 3952762641 = 250735^2 + 62871^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (66820802863) 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, 141325 + ... + 391936.

Almost surely, 2^66820802866 is an apocalyptic number.

66820802866 is a deficient number, since it is larger than the sum of its proper divisors (33412189178).

66820802866 is a wasteful number, since it uses less digits than its factorization.

66820802866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595916.

The product of its (nonzero) digits is 2654208, while the sum is 52.

The spelling of 66820802866 in words is "sixty-six billion, eight hundred twenty million, eight hundred two thousand, eight hundred sixty-six".