66868288669 has 32 divisors (see below), whose sum is σ = 82797612800. Its totient is φ = 52587532800.

The previous prime is 66868288661. The next prime is 66868288703. The reversal of 66868288669 is 96688286866.

It is a cyclic number.

It is not a de Polignac number, because 66868288669 - 2³ = 66868288661 is a prime.

It is a super-2 number, since 2×66868288669² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66868288661) 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 31 ways as a sum of consecutive naturals, for example, 10509049 + ... + 10515409.

It is an arithmetic number, because the mean of its divisors is an integer number (2587425400).

Almost surely, 2^66868288669 is an apocalyptic number.

It is an amenable number.

66868288669 is a deficient number, since it is larger than the sum of its proper divisors (15929324131).

66868288669 is a wasteful number, since it uses less digits than its factorization.

66868288669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7061.

The product of its digits is 573308928, while the sum is 73.

The spelling of 66868288669 in words is "sixty-six billion, eight hundred sixty-eight million, two hundred eighty-eight thousand, six hundred sixty-nine".