538554481820 has 96 divisors (see below), whose sum is σ = 1180726955520. Its totient is φ = 206105886720.

The previous prime is 538554481769. The next prime is 538554481837. The reversal of 538554481820 is 28184455835.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64285472 + ... + 64293848.

It is an arithmetic number, because the mean of its divisors is an integer number (12299239120).

Almost surely, 2^538554481820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 538554481820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (590363477760).

538554481820 is an abundant number, since it is smaller than the sum of its proper divisors (642172473700).

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

538554481820 is a wasteful number, since it uses less digits than its factorization.

538554481820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9583 (or 9581 counting only the distinct ones).

The product of its (nonzero) digits is 6144000, while the sum is 53.

The spelling of 538554481820 in words is "five hundred thirty-eight billion, five hundred fifty-four million, four hundred eighty-one thousand, eight hundred twenty".