866218868854 has 4 divisors (see below), whose sum is σ = 1299328303284. Its totient is φ = 433109434426.

The previous prime is 866218868783. The next prime is 866218868861. The reversal of 866218868854 is 458868812668.

It is a semiprime because it is the product of two primes.

It is a super-3 number, since 3×866218868854³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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, 216554717212 + ... + 216554717215.

It is an arithmetic number, because the mean of its divisors is an integer number (324832075821).

Almost surely, 2^866218868854 is an apocalyptic number.

866218868854 is a deficient number, since it is larger than the sum of its proper divisors (433109434430).

866218868854 is a wasteful number, since it uses less digits than its factorization.

866218868854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433109434429.

The product of its digits is 283115520, while the sum is 70.

The spelling of 866218868854 in words is "eight hundred sixty-six billion, two hundred eighteen million, eight hundred sixty-eight thousand, eight hundred fifty-four".