320866855 has 4 divisors (see below), whose sum is σ = 385040232. Its totient is φ = 256693480.

The previous prime is 320866853. The next prime is 320866873. The reversal of 320866855 is 558668023.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 320866855 - 2¹ = 320866853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320866853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32086681 + ... + 32086690.

It is an arithmetic number, because the mean of its divisors is an integer number (96260058).

Almost surely, 2^320866855 is an apocalyptic number.

320866855 is a deficient number, since it is larger than the sum of its proper divisors (64173377).

320866855 is an equidigital number, since it uses as much as digits as its factorization.

320866855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64173376.

The product of its (nonzero) digits is 345600, while the sum is 43.

The square root of 320866855 is about 17912.7567671757. The cubic root of 320866855 is about 684.6074473084.

The spelling of 320866855 in words is "three hundred twenty million, eight hundred sixty-six thousand, eight hundred fifty-five".