866512118277837 has 12 divisors (see below), whose sum is σ = 1264532003077980. Its totient is φ = 571719335770368.

The previous prime is 866512118277797. The next prime is 866512118277853. The reversal of 866512118277837 is 738772811215668.

866512118277837 is a `hidden beast` number, since 8 + 6 + 6 + 512 + 1 + 1 + 8 + 2 + 7 + 78 + 37 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 236322088218441 + 630190030059396 = 15372771^2 + 25103586^2 .

It is not a de Polignac number, because 866512118277837 - 2¹⁰ = 866512118276813 is a prime.

It is a super-2 number, since 2×866512118277837² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866512118277857) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 496284144762 + ... + 496284146507.

It is an arithmetic number, because the mean of its divisors is an integer number (105377666923165).

Almost surely, 2^{866512118277837} is an apocalyptic number.

It is an amenable number.

866512118277837 is a deficient number, since it is larger than the sum of its proper divisors (398019884800143).

866512118277837 is a wasteful number, since it uses less digits than its factorization.

866512118277837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992568291372 (or 992568291369 counting only the distinct ones).

The product of its digits is 379330560, while the sum is 72.

The spelling of 866512118277837 in words is "eight hundred sixty-six trillion, five hundred twelve billion, one hundred eighteen million, two hundred seventy-seven thousand, eight hundred thirty-seven".