538438666834836 has 36 divisors (see below), whose sum is σ = 1361054112049632. Its totient is φ = 179479448095824.

The previous prime is 538438666834823. The next prime is 538438666834841. The reversal of 538438666834836 is 638438666834835.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 76506631 + ... + 83247473.

Almost surely, 2^{538438666834836} is an apocalyptic number.

It is an amenable number.

538438666834836 is an abundant number, since it is smaller than the sum of its proper divisors (822615445214796).

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

538438666834836 is a wasteful number, since it uses less digits than its factorization.

538438666834836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8959660 (or 8959655 counting only the distinct ones).

The product of its digits is 34398535680, while the sum is 81.

Subtracting 538438666834836 from its reverse (638438666834835), we obtain a palindrome (99999999999999).

The spelling of 538438666834836 in words is "five hundred thirty-eight trillion, four hundred thirty-eight billion, six hundred sixty-six million, eight hundred thirty-four thousand, eight hundred thirty-six".