866868668 has 6 divisors (see below), whose sum is σ = 1517020176. Its totient is φ = 433434332.

The previous prime is 866868661. The next prime is 866868679.

866868668 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×866868668² = 1502922575120188448, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 866868668.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866868661) 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 as a sum of consecutive naturals, namely, 108358580 + ... + 108358587.

It is an arithmetic number, because the mean of its divisors is an integer number (252836696).

Almost surely, 2^866868668 is an apocalyptic number.

It is an amenable number.

866868668 is a deficient number, since it is larger than the sum of its proper divisors (650151508).

866868668 is a wasteful number, since it uses less digits than its factorization.

866868668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216717171 (or 216717169 counting only the distinct ones).

The product of its digits is 31850496, while the sum is 62.

The square root of 866868668 is about 29442.6335099291. The cubic root of 866868668 is about 953.4935700904.

The spelling of 866868668 in words is "eight hundred sixty-six million, eight hundred sixty-eight thousand, six hundred sixty-eight".