866220581780173 has 8 divisors (see below), whose sum is σ = 892766869378560. Its totient is φ = 840012463450800.

The previous prime is 866220581780137. The next prime is 866220581780179. The reversal of 866220581780173 is 371087185022668.

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-866220581780173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866220581780179) 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, 84542312053 + ... + 84542322298.

It is an arithmetic number, because the mean of its divisors is an integer number (111595858672320).

Almost surely, 2^{866220581780173} is an apocalyptic number.

It is an amenable number.

866220581780173 is a deficient number, since it is larger than the sum of its proper divisors (26546287598387).

866220581780173 is a wasteful number, since it uses less digits than its factorization.

866220581780173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169084634507.

The product of its (nonzero) digits is 54190080, while the sum is 64.

The spelling of 866220581780173 in words is "eight hundred sixty-six trillion, two hundred twenty billion, five hundred eighty-one million, seven hundred eighty thousand, one hundred seventy-three".