866786517537447 has 8 divisors (see below), whose sum is σ = 1244616538002544. Its totient is φ = 533407087715328.

The previous prime is 866786517537431. The next prime is 866786517537509. The reversal of 866786517537447 is 744735715687668.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 866786517537447 - 2⁴ = 866786517537431 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 866786517537447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866786517537407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11112647660698 + ... + 11112647660775.

It is an arithmetic number, because the mean of its divisors is an integer number (155577067250318).

Almost surely, 2^{866786517537447} is an apocalyptic number.

866786517537447 is a deficient number, since it is larger than the sum of its proper divisors (377830020465097).

866786517537447 is a wasteful number, since it uses less digits than its factorization.

866786517537447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22225295321489.

The product of its digits is 39829708800, while the sum is 84.

The spelling of 866786517537447 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, five hundred seventeen million, five hundred thirty-seven thousand, four hundred forty-seven".