643254550122 has 16 divisors (see below), whose sum is σ = 1354220105760. Its totient is φ = 203133015792.

The previous prime is 643254550009. The next prime is 643254550123. The reversal of 643254550122 is 221055452346.

It is a super-2 number, since 2×643254550122² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (643254550123) 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 7 ways as a sum of consecutive naturals, for example, 2821291773 + ... + 2821292000.

It is an arithmetic number, because the mean of its divisors is an integer number (84638756610).

Almost surely, 2^643254550122 is an apocalyptic number.

643254550122 is an abundant number, since it is smaller than the sum of its proper divisors (710965555638).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643254550122 is a wasteful number, since it uses less digits than its factorization.

643254550122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5642583797.

The product of its (nonzero) digits is 288000, while the sum is 39.

The spelling of 643254550122 in words is "six hundred forty-three billion, two hundred fifty-four million, five hundred fifty thousand, one hundred twenty-two".