643126343162 has 4 divisors (see below), whose sum is σ = 964689514746. Its totient is φ = 321563171580.

The previous prime is 643126343161. The next prime is 643126343213. The reversal of 643126343162 is 261343621346.

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

It can be written as a sum of positive squares in only one way, i.e., 595488479041 + 47637864121 = 771679^2 + 218261^2 .

It is a super-2 number, since 2×643126343162² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (643126343161) 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 as a sum of consecutive naturals, namely, 160781585789 + ... + 160781585792.

Almost surely, 2^643126343162 is an apocalyptic number.

643126343162 is a deficient number, since it is larger than the sum of its proper divisors (321563171584).

643126343162 is a wasteful number, since it uses less digits than its factorization.

643126343162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321563171583.

The product of its digits is 373248, while the sum is 41.

The spelling of 643126343162 in words is "six hundred forty-three billion, one hundred twenty-six million, three hundred forty-three thousand, one hundred sixty-two".