866511477468605 has 8 divisors (see below), whose sum is σ = 1059432900754392. Its totient is φ = 680129763446848.

The previous prime is 866511477468587. The next prime is 866511477468631. The reversal of 866511477468605 is 506864774115668.

It can be written as a sum of positive squares in 4 ways, for example, as 30135938723641 + 836375538744964 = 5489621^2 + 28920158^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 866511477468605 - 2¹² = 866511477464509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1634927315714 + ... + 1634927316243.

It is an arithmetic number, because the mean of its divisors is an integer number (132429112594299).

Almost surely, 2^{866511477468605} is an apocalyptic number.

It is an amenable number.

866511477468605 is a deficient number, since it is larger than the sum of its proper divisors (192921423285787).

866511477468605 is a wasteful number, since it uses less digits than its factorization.

866511477468605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3269854632015.

The product of its (nonzero) digits is 1625702400, while the sum is 74.

The spelling of 866511477468605 in words is "eight hundred sixty-six trillion, five hundred eleven billion, four hundred seventy-seven million, four hundred sixty-eight thousand, six hundred five".