866640011 has 4 divisors (see below), whose sum is σ = 890062752. Its totient is φ = 843217272.

The previous prime is 866640007. The next prime is 866640029. The reversal of 866640011 is 110046668.

It is a happy number.

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

It is not a de Polignac number, because 866640011 - 2² = 866640007 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 866640011.

It is not an unprimeable number, because it can be changed into a prime (866640311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11711315 + ... + 11711388.

It is an arithmetic number, because the mean of its divisors is an integer number (222515688).

Almost surely, 2^866640011 is an apocalyptic number.

866640011 is a deficient number, since it is larger than the sum of its proper divisors (23422741).

866640011 is a wasteful number, since it uses less digits than its factorization.

866640011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23422740.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 866640011 is about 29438.7501602904. The cubic root of 866640011 is about 953.4097272663.

Adding to 866640011 its reverse (110046668), we get a palindrome (976686679).

The spelling of 866640011 in words is "eight hundred sixty-six million, six hundred forty thousand, eleven".