866444205661761 has 8 divisors (see below), whose sum is σ = 1155271602590560. Its totient is φ = 577623139587072.

The previous prime is 866444205661751. The next prime is 866444205661781. The reversal of 866444205661761 is 167166502444668.

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

It is not a de Polignac number, because 866444205661761 - 2¹⁴ = 866444205645377 is a prime.

It is a super-2 number, since 2×866444205661761² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 866444205661692 and 866444205661701.

It is not an unprimeable number, because it can be changed into a prime (866444205661711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1582394176 + ... + 1582941633.

It is an arithmetic number, because the mean of its divisors is an integer number (144408950323820).

Almost surely, 2^{866444205661761} is an apocalyptic number.

It is an amenable number.

866444205661761 is a deficient number, since it is larger than the sum of its proper divisors (288827396928799).

866444205661761 is a wasteful number, since it uses less digits than its factorization.

866444205661761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3165427055.

The product of its (nonzero) digits is 278691840, while the sum is 66.

The spelling of 866444205661761 in words is "eight hundred sixty-six trillion, four hundred forty-four billion, two hundred five million, six hundred sixty-one thousand, seven hundred sixty-one".