51166222500 has 240 divisors, whose sum is σ = 154993386240. Its totient is φ = 13117440000.

The previous prime is 51166222483. The next prime is 51166222531. The reversal of 51166222500 is 522266115.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 79822180 + ... + 79822820.

It is an arithmetic number, because the mean of its divisors is an integer number (645805776).

Almost surely, 2^51166222500 is an apocalyptic number.

51166222500 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 51166222500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77496693120).

51166222500 is an abundant number, since it is smaller than the sum of its proper divisors (103827163740).

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

51166222500 is a wasteful number, since it uses less digits than its factorization.

51166222500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064 (or 1047 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

Adding to 51166222500 its reverse (522266115), we get a palindrome (51688488615).

The spelling of 51166222500 in words is "fifty-one billion, one hundred sixty-six million, two hundred twenty-two thousand, five hundred".