866786486868226 has 4 divisors (see below), whose sum is σ = 1300179730302342. Its totient is φ = 433393243434112.

The previous prime is 866786486868163. The next prime is 866786486868257. The reversal of 866786486868226 is 622868684687668.

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., 794029834746225 + 72756652122001 = 28178535^2 + 8529751^2 .

It is a super-2 number, since 2×866786486868226² (a number of 31 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 216696621717055 + ... + 216696621717058.

Almost surely, 2^{866786486868226} is an apocalyptic number.

866786486868226 is a deficient number, since it is larger than the sum of its proper divisors (433393243434116).

866786486868226 is a wasteful number, since it uses less digits than its factorization.

866786486868226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433393243434115.

The product of its digits is 171228266496, while the sum is 91.

The spelling of 866786486868226 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, four hundred eighty-six million, eight hundred sixty-eight thousand, two hundred twenty-six".