866788774644146 has 4 divisors (see below), whose sum is σ = 1300183161966222. Its totient is φ = 433394387322072.

The previous prime is 866788774644131. The next prime is 866788774644181. The reversal of 866788774644146 is 641446477887668.

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

It can be written as a sum of positive squares in only one way, i.e., 720915787515625 + 145872987128521 = 26849875^2 + 12077789^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 216697193661035 + ... + 216697193661038.

Almost surely, 2^{866788774644146} is an apocalyptic number.

866788774644146 is a deficient number, since it is larger than the sum of its proper divisors (433394387322076).

866788774644146 is a wasteful number, since it uses less digits than its factorization.

866788774644146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433394387322075.

The product of its digits is 58265174016, while the sum is 86.

The spelling of 866788774644146 in words is "eight hundred sixty-six trillion, seven hundred eighty-eight billion, seven hundred seventy-four million, six hundred forty-four thousand, one hundred forty-six".