866786514051361 has 4 divisors (see below), whose sum is σ = 877229725064112. Its totient is φ = 856343303038612.

The previous prime is 866786514051319. The next prime is 866786514051421. The reversal of 866786514051361 is 163150415687668.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 866786514051361 - 2⁴³ = 857990421029153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866786514151361) 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, 5221605506251 + ... + 5221605506416.

It is an arithmetic number, because the mean of its divisors is an integer number (219307431266028).

Almost surely, 2^{866786514051361} is an apocalyptic number.

It is an amenable number.

866786514051361 is a deficient number, since it is larger than the sum of its proper divisors (10443211012751).

866786514051361 is a wasteful number, since it uses less digits than its factorization.

866786514051361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10443211012750.

The product of its (nonzero) digits is 174182400, while the sum is 67.

The spelling of 866786514051361 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, five hundred fourteen million, fifty-one thousand, three hundred sixty-one".