866786278583690 has 8 divisors (see below), whose sum is σ = 1560215301450660. Its totient is φ = 346714511433472.

The previous prime is 866786278583689. The next prime is 866786278583833. The reversal of 866786278583690 is 96385872687668.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 841365613727809 + 25420664855881 = 29006303^2 + 5041891^2 .

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

It is a super-2 number, since 2×866786278583690² (a number of 31 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 866786278583596 and 866786278583605.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43339313929175 + ... + 43339313929194.

Almost surely, 2^{866786278583690} is an apocalyptic number.

866786278583690 is a deficient number, since it is larger than the sum of its proper divisors (693429022866970).

866786278583690 is a wasteful number, since it uses less digits than its factorization.

866786278583690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86678627858376.

The product of its (nonzero) digits is 70230343680, while the sum is 89.

The spelling of 866786278583690 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, two hundred seventy-eight million, five hundred eighty-three thousand, six hundred ninety".