51017655500 has 192 divisors, whose sum is σ = 132506599680. Its totient is φ = 16789248000.

The previous prime is 51017655449. The next prime is 51017655517. The reversal of 51017655500 is 555671015.

51017655500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (35).

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, 18370112 + ... + 18372888.

It is an arithmetic number, because the mean of its divisors is an integer number (690138540).

Almost surely, 2^51017655500 is an apocalyptic number.

51017655500 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 51017655500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66253299840).

51017655500 is an abundant number, since it is smaller than the sum of its proper divisors (81488944180).

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

51017655500 is a wasteful number, since it uses less digits than its factorization.

51017655500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3013 (or 3001 counting only the distinct ones).

The product of its (nonzero) digits is 26250, while the sum is 35.

The spelling of 51017655500 in words is "fifty-one billion, seventeen million, six hundred fifty-five thousand, five hundred".