320663155 has 4 divisors (see below), whose sum is σ = 384795792. Its totient is φ = 256530520.

The previous prime is 320663117. The next prime is 320663177. The reversal of 320663155 is 551366023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 551366023 = 13 ⋅42412771.

It is not a de Polignac number, because 320663155 - 2¹⁷ = 320532083 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 32066311 + ... + 32066320.

It is an arithmetic number, because the mean of its divisors is an integer number (96198948).

Almost surely, 2^320663155 is an apocalyptic number.

320663155 is a deficient number, since it is larger than the sum of its proper divisors (64132637).

320663155 is an equidigital number, since it uses as much as digits as its factorization.

320663155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64132636.

The product of its (nonzero) digits is 16200, while the sum is 31.

The square root of 320663155 is about 17907.0699724997. The cubic root of 320663155 is about 684.4625439466.

The spelling of 320663155 in words is "three hundred twenty million, six hundred sixty-three thousand, one hundred fifty-five".