866540112413647 has 4 divisors (see below), whose sum is σ = 990331557044176. Its totient is φ = 742748667783120.

The previous prime is 866540112413627. The next prime is 866540112413683. The reversal of 866540112413647 is 746314211045668.

It is a happy number.

866540112413647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 866540112413647 - 2³¹ = 866537964929999 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 866540112413591 and 866540112413600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866540112413617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61895722315254 + ... + 61895722315267.

It is an arithmetic number, because the mean of its divisors is an integer number (247582889261044).

Almost surely, 2^{866540112413647} is an apocalyptic number.

866540112413647 is a deficient number, since it is larger than the sum of its proper divisors (123791444630529).

866540112413647 is a wasteful number, since it uses less digits than its factorization.

866540112413647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123791444630528.

The product of its (nonzero) digits is 23224320, while the sum is 58.

The spelling of 866540112413647 in words is "eight hundred sixty-six trillion, five hundred forty billion, one hundred twelve million, four hundred thirteen thousand, six hundred forty-seven".