66868894285 has 4 divisors (see below), whose sum is σ = 80242673148. Its totient is φ = 53495115424.

The previous prime is 66868894283. The next prime is 66868894319. The reversal of 66868894285 is 58249886866.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58249886866 = 2 ⋅29124943433.

It can be written as a sum of positive squares in 2 ways, for example, as 7217182116 + 59651712169 = 84954^2 + 244237^2 .

It is a cyclic number.

It is not a de Polignac number, because 66868894285 - 2¹ = 66868894283 is a prime.

It is a super-2 number, since 2×66868894285² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66868894283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6686889424 + ... + 6686889433.

It is an arithmetic number, because the mean of its divisors is an integer number (20060668287).

Almost surely, 2^66868894285 is an apocalyptic number.

It is an amenable number.

66868894285 is a deficient number, since it is larger than the sum of its proper divisors (13373778863).

66868894285 is a wasteful number, since it uses less digits than its factorization.

66868894285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13373778862.

The product of its digits is 318504960, while the sum is 70.

The spelling of 66868894285 in words is "sixty-six billion, eight hundred sixty-eight million, eight hundred ninety-four thousand, two hundred eighty-five".