866212279328 has 54 divisors (see below), whose sum is σ = 1874606915853. Its totient is φ = 393706529920.

The previous prime is 866212279267. The next prime is 866212279357. The reversal of 866212279328 is 823972212668.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 809402510224 + 56809769104 = 899668^2 + 238348^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=658108.

It is a super-2 number, since 2×866212279328² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 57906026 + ... + 57920982.

Almost surely, 2^866212279328 is an apocalyptic number.

866212279328 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

866212279328 is an abundant number, since it is smaller than the sum of its proper divisors (1008394636525).

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

866212279328 is an frugal number, since it uses more digits than its factorization.

866212279328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29946 (or 14970 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 56.

The spelling of 866212279328 in words is "eight hundred sixty-six billion, two hundred twelve million, two hundred seventy-nine thousand, three hundred twenty-eight".