866778011617 has 8 divisors (see below), whose sum is σ = 990830835776. Its totient is φ = 742782035952.

The previous prime is 866778011581. The next prime is 866778011647. The reversal of 866778011617 is 716110877668.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866778011617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866778011647) 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, 14179443 + ... + 14240440.

It is an arithmetic number, because the mean of its divisors is an integer number (123853854472).

Almost surely, 2^866778011617 is an apocalyptic number.

It is an amenable number.

866778011617 is a deficient number, since it is larger than the sum of its proper divisors (124052824159).

866778011617 is a wasteful number, since it uses less digits than its factorization.

866778011617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28424247.

The product of its (nonzero) digits is 4741632, while the sum is 58.

The spelling of 866778011617 in words is "eight hundred sixty-six billion, seven hundred seventy-eight million, eleven thousand, six hundred seventeen".