42161326389 has 128 divisors (see below), whose sum is σ = 79743283200. Its totient is φ = 21413548800.

The previous prime is 42161326387. The next prime is 42161326399. The reversal of 42161326389 is 98362316124.

42161326389 is a `hidden beast` number, since 4 + 2 + 1 + 6 + 1 + 3 + 2 + 638 + 9 = 666.

It is not a de Polignac number, because 42161326389 - 2¹ = 42161326387 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42161326387) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 40114914 + ... + 40115964.

It is an arithmetic number, because the mean of its divisors is an integer number (622994400).

Almost surely, 2^42161326389 is an apocalyptic number.

It is an amenable number.

42161326389 is a deficient number, since it is larger than the sum of its proper divisors (37581956811).

42161326389 is a wasteful number, since it uses less digits than its factorization.

42161326389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1672 (or 1666 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The spelling of 42161326389 in words is "forty-two billion, one hundred sixty-one million, three hundred twenty-six thousand, three hundred eighty-nine".