42171178644 has 72 divisors (see below), whose sum is σ = 121849302848. Its totient is φ = 12046786560.

The previous prime is 42171178627. The next prime is 42171178649. The reversal of 42171178644 is 44687117124.

It is a super-4 number, since 4×42171178644⁴ (a number of 44 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 42171178644.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42171178649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1924719 + ... + 1946505.

Almost surely, 2^42171178644 is an apocalyptic number.

It is an amenable number.

42171178644 is an abundant number, since it is smaller than the sum of its proper divisors (79678124204).

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

42171178644 is a wasteful number, since it uses less digits than its factorization.

42171178644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29485 (or 29480 counting only the distinct ones).

The product of its digits is 301056, while the sum is 45.

The spelling of 42171178644 in words is "forty-two billion, one hundred seventy-one million, one hundred seventy-eight thousand, six hundred forty-four".