642226440042 has 80 divisors (see below), whose sum is σ = 1573294260384. Its totient is φ = 194191668000.

The previous prime is 642226440013. The next prime is 642226440049. The reversal of 642226440042 is 240044622246.

642226440042 is a `hidden beast` number, since 6 + 4 + 2 + 2 + 2 + 644 + 0 + 0 + 4 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 642226439979 and 642226440006.

It is not an unprimeable number, because it can be changed into a prime (642226440049) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 430617 + ... + 1212387.

Almost surely, 2^642226440042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642226440042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (786647130192).

642226440042 is an abundant number, since it is smaller than the sum of its proper divisors (931067820342).

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

642226440042 is a wasteful number, since it uses less digits than its factorization.

642226440042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782257 (or 782248 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 36.

The spelling of 642226440042 in words is "six hundred forty-two billion, two hundred twenty-six million, four hundred forty thousand, forty-two".