866127326010805 has 16 divisors (see below), whose sum is σ = 1039743657126000. Its totient is φ = 692641330404352.

The previous prime is 866127326010721. The next prime is 866127326010823. The reversal of 866127326010805 is 508010623721668.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 90787700514564 + 775339625496241 = 9528258^2 + 27844921^2 .

It is a cyclic number.

It is not a de Polignac number, because 866127326010805 - 2⁹ = 866127326010293 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145189071 + ... + 151036819.

It is an arithmetic number, because the mean of its divisors is an integer number (64983978570375).

Almost surely, 2^{866127326010805} is an apocalyptic number.

It is an amenable number.

866127326010805 is a deficient number, since it is larger than the sum of its proper divisors (173616331115195).

866127326010805 is a wasteful number, since it uses less digits than its factorization.

866127326010805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5858888.

The product of its (nonzero) digits is 5806080, while the sum is 55.

The spelling of 866127326010805 in words is "eight hundred sixty-six trillion, one hundred twenty-seven billion, three hundred twenty-six million, ten thousand, eight hundred five".