51831432805920 has 384 divisors, whose sum is σ = 172442692316160. Its totient is φ = 13050061516800.

The previous prime is 51831432805879. The next prime is 51831432805937. The reversal of 51831432805920 is 2950823413815.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12187026514 + ... + 12187030766.

It is an arithmetic number, because the mean of its divisors is an integer number (449069511240).

Almost surely, 2^{51831432805920} 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 51831432805920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86221346158080).

51831432805920 is an abundant number, since it is smaller than the sum of its proper divisors (120611259510240).

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

51831432805920 is a wasteful number, since it uses less digits than its factorization.

51831432805920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8488 (or 8480 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 51.

The spelling of 51831432805920 in words is "fifty-one trillion, eight hundred thirty-one billion, four hundred thirty-two million, eight hundred five thousand, nine hundred twenty".