643165216663222 has 32 divisors (see below), whose sum is σ = 1098692425119744. Its totient is φ = 279514456161600.

The previous prime is 643165216663213. The next prime is 643165216663223. The reversal of 643165216663222 is 222366612561346.

It is a super-2 number, since 2×643165216663222² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643165216663223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 277468678 + ... + 279777049.

It is an arithmetic number, because the mean of its divisors is an integer number (34334138284992).

Almost surely, 2^{643165216663222} is an apocalyptic number.

643165216663222 is a deficient number, since it is larger than the sum of its proper divisors (455527208456522).

643165216663222 is a wasteful number, since it uses less digits than its factorization.

643165216663222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557248044.

The product of its digits is 22394880, while the sum is 55.

The spelling of 643165216663222 in words is "six hundred forty-three trillion, one hundred sixty-five billion, two hundred sixteen million, six hundred sixty-three thousand, two hundred twenty-two".