866222639808 has 56 divisors (see below), whose sum is σ = 2292359365488. Its totient is φ = 288680580096.

The previous prime is 866222639803. The next prime is 866222639857. The reversal of 866222639808 is 808936222668.

It is not an unprimeable number, because it can be changed into a prime (866222639803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 455410 + ... + 1392782.

Almost surely, 2^866222639808 is an apocalyptic number.

It is an amenable number.

866222639808 is an abundant number, since it is smaller than the sum of its proper divisors (1426136725680).

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

866222639808 is a wasteful number, since it uses less digits than its factorization.

866222639808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 942201 (or 942191 counting only the distinct ones).

The product of its (nonzero) digits is 23887872, while the sum is 60.

The spelling of 866222639808 in words is "eight hundred sixty-six billion, two hundred twenty-two million, six hundred thirty-nine thousand, eight hundred eight".