866405331771 has 8 divisors (see below), whose sum is σ = 1320236696064. Its totient is φ = 495088761000.

The previous prime is 866405331739. The next prime is 866405331817. The reversal of 866405331771 is 177133504668.

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

It is not a de Polignac number, because 866405331771 - 2⁵ = 866405331739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (866405331371) 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, 20628698355 + ... + 20628698396.

It is an arithmetic number, because the mean of its divisors is an integer number (165029587008).

Almost surely, 2^866405331771 is an apocalyptic number.

866405331771 is a deficient number, since it is larger than the sum of its proper divisors (453831364293).

866405331771 is a wasteful number, since it uses less digits than its factorization.

866405331771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41257396761.

The product of its (nonzero) digits is 2540160, while the sum is 51.

The spelling of 866405331771 in words is "eight hundred sixty-six billion, four hundred five million, three hundred thirty-one thousand, seven hundred seventy-one".