51006005500 has 48 divisors (see below), whose sum is σ = 111585618144. Its totient is φ = 20367878400.

The previous prime is 51006005489. The next prime is 51006005503. The reversal of 51006005500 is 550060015.

51006005500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×51006005500² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51006005503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 210487 + ... + 382513.

It is an arithmetic number, because the mean of its divisors is an integer number (2324700378).

Almost surely, 2^51006005500 is an apocalyptic number.

51006005500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51006005500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55792809072).

51006005500 is an abundant number, since it is smaller than the sum of its proper divisors (60579612644).

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

51006005500 is a wasteful number, since it uses less digits than its factorization.

51006005500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172639 (or 172627 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 22.

Adding to 51006005500 its reverse (550060015), we get a palindrome (51556065515).

The spelling of 51006005500 in words is "fifty-one billion, six million, five thousand, five hundred".