643303111155 has 16 divisors (see below), whose sum is σ = 1074036499200. Its totient is φ = 328177818848.

The previous prime is 643303111147. The next prime is 643303111159. The reversal of 643303111155 is 551111303346.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 643303111155 - 2³ = 643303111147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643303111159) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 932323005 + ... + 932323694.

It is an arithmetic number, because the mean of its divisors is an integer number (67127281200).

Almost surely, 2^643303111155 is an apocalyptic number.

643303111155 is a deficient number, since it is larger than the sum of its proper divisors (430733388045).

643303111155 is a wasteful number, since it uses less digits than its factorization.

643303111155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1864646730.

The product of its (nonzero) digits is 16200, while the sum is 33.

The spelling of 643303111155 in words is "six hundred forty-three billion, three hundred three million, one hundred eleven thousand, one hundred fifty-five".