42438642650 has 24 divisors (see below), whose sum is σ = 78943814460. Its totient is φ = 16973749760.

The previous prime is 42438642643. The next prime is 42438642661. The reversal of 42438642650 is 5624683424.

It is a happy number.

42438642650 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 3731621569 + 38707021081 = 61087^2 + 196741^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 537512 + ... + 611388.

Almost surely, 2^42438642650 is an apocalyptic number.

42438642650 is a deficient number, since it is larger than the sum of its proper divisors (36505171810).

42438642650 is a wasteful number, since it uses less digits than its factorization.

42438642650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85378 (or 85373 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 44.

The spelling of 42438642650 in words is "forty-two billion, four hundred thirty-eight million, six hundred forty-two thousand, six hundred fifty".