806555550866 has 8 divisors (see below), whose sum is σ = 1302897428364. Its totient is φ = 372256408080.

The previous prime is 806555550859. The next prime is 806555550923. The reversal of 806555550866 is 668055555608.

It can be written as a sum of positive squares in 2 ways, for example, as 796504485841 + 10051065025 = 892471^2 + 100255^2 .

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

It is a super-4 number, since 4×806555550866⁴ (a number of 49 digits) contains 4444 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15510683645 + ... + 15510683696.

Almost surely, 2^806555550866 is an apocalyptic number.

806555550866 is a deficient number, since it is larger than the sum of its proper divisors (496341877498).

806555550866 is a wasteful number, since it uses less digits than its factorization.

806555550866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31021367356.

The product of its (nonzero) digits is 43200000, while the sum is 59.

The spelling of 806555550866 in words is "eight hundred six billion, five hundred fifty-five million, five hundred fifty thousand, eight hundred sixty-six".