642424044226 has 4 divisors (see below), whose sum is σ = 963636066342. Its totient is φ = 321212022112.

The previous prime is 642424044191. The next prime is 642424044253. The reversal of 642424044226 is 622440424246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 622440424246 = 2 ⋅311220212123.

It can be written as a sum of positive squares in only one way, i.e., 640638559201 + 1785485025 = 800399^2 + 42255^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160606011055 + ... + 160606011058.

Almost surely, 2^642424044226 is an apocalyptic number.

642424044226 is a deficient number, since it is larger than the sum of its proper divisors (321212022116).

642424044226 is a wasteful number, since it uses less digits than its factorization.

642424044226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321212022115.

The product of its (nonzero) digits is 589824, while the sum is 40.

The spelling of 642424044226 in words is "six hundred forty-two billion, four hundred twenty-four million, forty-four thousand, two hundred twenty-six".