866805234621018 has 64 divisors (see below), whose sum is σ = 2161521373777920. Its totient is φ = 225129957134400.

The previous prime is 866805234620987. The next prime is 866805234621047. The reversal of 866805234621018 is 810126432508668.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52111873 + ... + 66702756.

It is an arithmetic number, because the mean of its divisors is an integer number (33773771465280).

Almost surely, 2^{866805234621018} is an apocalyptic number.

866805234621018 is an abundant number, since it is smaller than the sum of its proper divisors (1294716139156902).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

866805234621018 is a wasteful number, since it uses less digits than its factorization.

866805234621018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118830443.

The product of its (nonzero) digits is 26542080, while the sum is 60.

The spelling of 866805234621018 in words is "eight hundred sixty-six trillion, eight hundred five billion, two hundred thirty-four million, six hundred twenty-one thousand, eighteen".