866761260055841 has 4 divisors (see below), whose sum is σ = 917747216529732. Its totient is φ = 815775303581952.

The previous prime is 866761260055811. The next prime is 866761260055927. The reversal of 866761260055841 is 148550062167668.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 454992789913600 + 411768470142241 = 21330560^2 + 20292079^2 .

It is a cyclic number.

It is not a de Polignac number, because 866761260055841 - 2⁶ = 866761260055777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866761260055811) 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 3 ways as a sum of consecutive naturals, for example, 25492978236920 + ... + 25492978236953.

It is an arithmetic number, because the mean of its divisors is an integer number (229436804132433).

Almost surely, 2^{866761260055841} is an apocalyptic number.

It is an amenable number.

866761260055841 is a deficient number, since it is larger than the sum of its proper divisors (50985956473891).

866761260055841 is a wasteful number, since it uses less digits than its factorization.

866761260055841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50985956473890.

The product of its (nonzero) digits is 116121600, while the sum is 65.

The spelling of 866761260055841 in words is "eight hundred sixty-six trillion, seven hundred sixty-one billion, two hundred sixty million, fifty-five thousand, eight hundred forty-one".