800666155 has 16 divisors (see below), whose sum is σ = 967093344. Its totient is φ = 636352000.

The previous prime is 800666143. The next prime is 800666159. The reversal of 800666155 is 551666008.

It is not a de Polignac number, because 800666155 - 2¹⁵ = 800633387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (800666159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 819027 + ... + 820003.

It is an arithmetic number, because the mean of its divisors is an integer number (60443334).

Almost surely, 2^800666155 is an apocalyptic number.

800666155 is a deficient number, since it is larger than the sum of its proper divisors (166427189).

800666155 is a wasteful number, since it uses less digits than its factorization.

800666155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1886.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 800666155 is about 28296.0448649630. The cubic root of 800666155 is about 928.5753633702.

The spelling of 800666155 in words is "eight hundred million, six hundred sixty-six thousand, one hundred fifty-five".