51111648500 has 96 divisors (see below), whose sum is σ = 121865313024. Its totient is φ = 18572400000.

The previous prime is 51111648463. The next prime is 51111648569. The reversal of 51111648500 is 584611115.

It is a super-2 number, since 2×51111648500² (a number of 22 digits) contains 22 as substring.

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, 10321025 + ... + 10325975.

It is an arithmetic number, because the mean of its divisors is an integer number (1269430344).

Almost surely, 2^51111648500 is an apocalyptic number.

51111648500 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 51111648500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60932656512).

51111648500 is an abundant number, since it is smaller than the sum of its proper divisors (70753664524).

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

51111648500 is a wasteful number, since it uses less digits than its factorization.

51111648500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6858 (or 6846 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 32.

The spelling of 51111648500 in words is "fifty-one billion, one hundred eleven million, six hundred forty-eight thousand, five hundred".