42542236515220 has 24 divisors (see below), whose sum is σ = 96210904119624. Its totient is φ = 15707902713216.

The previous prime is 42542236515217. The next prime is 42542236515221. The reversal of 42542236515220 is 2251563224524.

It can be written as a sum of positive squares in 4 ways, for example, as 2161829139856 + 40380407375364 = 1470316^2 + 6354558^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42542236515221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81811993039 + ... + 81811993558.

It is an arithmetic number, because the mean of its divisors is an integer number (4008787671651).

Almost surely, 2^{42542236515220} is an apocalyptic number.

It is an amenable number.

42542236515220 is an abundant number, since it is smaller than the sum of its proper divisors (53668667604404).

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

42542236515220 is a wasteful number, since it uses less digits than its factorization.

42542236515220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163623986619 (or 163623986617 counting only the distinct ones).

The product of its (nonzero) digits is 1152000, while the sum is 43.

Adding to 42542236515220 its reverse (2251563224524), we get a palindrome (44793799739744).

The spelling of 42542236515220 in words is "forty-two trillion, five hundred forty-two billion, two hundred thirty-six million, five hundred fifteen thousand, two hundred twenty".