866398011 has 4 divisors (see below), whose sum is σ = 1155197352. Its totient is φ = 577598672.

The previous prime is 866398009. The next prime is 866398021. The reversal of 866398011 is 110893668.

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

It is a cyclic number.

It is not a de Polignac number, because 866398011 - 2¹ = 866398009 is a prime.

It is a super-3 number, since 3×866398011³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (866398021) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 144399666 + ... + 144399671.

It is an arithmetic number, because the mean of its divisors is an integer number (288799338).

Almost surely, 2^866398011 is an apocalyptic number.

866398011 is a deficient number, since it is larger than the sum of its proper divisors (288799341).

866398011 is a wasteful number, since it uses less digits than its factorization.

866398011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288799340.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 866398011 is about 29434.6396444733. The cubic root of 866398011 is about 953.3209758316.

The spelling of 866398011 in words is "eight hundred sixty-six million, three hundred ninety-eight thousand, eleven".