42506621646 has 16 divisors (see below), whose sum is σ = 87944734800. Its totient is φ = 13680291968.

The previous prime is 42506621561. The next prime is 42506621683. The reversal of 42506621646 is 64612660524.

It is a junction number, because it is equal to n+sod(n) for n = 42506621598 and 42506621607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122145291 + ... + 122145638.

It is an arithmetic number, because the mean of its divisors is an integer number (5496545925).

Almost surely, 2^42506621646 is an apocalyptic number.

42506621646 is an abundant number, since it is smaller than the sum of its proper divisors (45438113154).

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

42506621646 is a wasteful number, since it uses less digits than its factorization.

42506621646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244290963.

The product of its (nonzero) digits is 414720, while the sum is 42.

The spelling of 42506621646 in words is "forty-two billion, five hundred six million, six hundred twenty-one thousand, six hundred forty-six".