866187274674128 has 120 divisors (see below), whose sum is σ = 1917879447025920. Its totient is φ = 378279634867200.

The previous prime is 866187274673999. The next prime is 866187274674157. The reversal of 866187274674128 is 821476472781668.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43573625 + ... + 60258072.

It is an arithmetic number, because the mean of its divisors is an integer number (15982328725216).

Almost surely, 2^{866187274674128} is an apocalyptic number.

866187274674128 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

866187274674128 is an abundant number, since it is smaller than the sum of its proper divisors (1051692172351792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

866187274674128 is a wasteful number, since it uses less digits than its factorization.

866187274674128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103831897 (or 103831880 counting only the distinct ones).

The product of its digits is 2427715584, while the sum is 77.

The spelling of 866187274674128 in words is "eight hundred sixty-six trillion, one hundred eighty-seven billion, two hundred seventy-four million, six hundred seventy-four thousand, one hundred twenty-eight".