42644200642 has 4 divisors (see below), whose sum is σ = 63966300966. Its totient is φ = 21322100320.

The previous prime is 42644200639. The next prime is 42644200649. The reversal of 42644200642 is 24600244624.

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., 40913557441 + 1730643201 = 202271^2 + 41601^2 .

It is a junction number, because it is equal to n+sod(n) for n = 42644200598 and 42644200607.

It is not an unprimeable number, because it can be changed into a prime (42644200649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661050159 + ... + 10661050162.

Almost surely, 2^42644200642 is an apocalyptic number.

42644200642 is a deficient number, since it is larger than the sum of its proper divisors (21322100324).

42644200642 is a wasteful number, since it uses less digits than its factorization.

42644200642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21322100323.

The product of its (nonzero) digits is 73728, while the sum is 34.

The spelling of 42644200642 in words is "forty-two billion, six hundred forty-four million, two hundred thousand, six hundred forty-two".