866786514038247 has 96 divisors (see below), whose sum is σ = 1289331454924800. Its totient is φ = 517505171641920.

The previous prime is 866786514038243. The next prime is 866786514038297. The reversal of 866786514038247 is 742830415687668.

It is a happy number.

It is not a de Polignac number, because 866786514038247 - 2² = 866786514038243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866786514038243) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 80834324028 + ... + 80834334750.

It is an arithmetic number, because the mean of its divisors is an integer number (13430535988800).

Almost surely, 2^{866786514038247} is an apocalyptic number.

866786514038247 is a deficient number, since it is larger than the sum of its proper divisors (422544940886553).

866786514038247 is a wasteful number, since it uses less digits than its factorization.

866786514038247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18289 (or 18278 counting only the distinct ones).

The product of its (nonzero) digits is 2601123840, while the sum is 75.

The spelling of 866786514038247 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, five hundred fourteen million, thirty-eight thousand, two hundred forty-seven".