866761258822887 has 8 divisors (see below), whose sum is σ = 1155815701621504. Its totient is φ = 577773827619768.

The previous prime is 866761258822867. The next prime is 866761258822909. The reversal of 866761258822887 is 788228852167668.

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

It is not a de Polignac number, because 866761258822887 - 2⁴⁷ = 726023770467559 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 (866761258822867) 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, 16752868693 + ... + 16752920430.

It is an arithmetic number, because the mean of its divisors is an integer number (144476962702688).

Almost surely, 2^{866761258822887} is an apocalyptic number.

866761258822887 is a deficient number, since it is larger than the sum of its proper divisors (289054442798617).

866761258822887 is a wasteful number, since it uses less digits than its factorization.

866761258822887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33505797749.

The product of its digits is 13872660480, while the sum is 84.

The spelling of 866761258822887 in words is "eight hundred sixty-six trillion, seven hundred sixty-one billion, two hundred fifty-eight million, eight hundred twenty-two thousand, eight hundred eighty-seven".