51722968500 has 384 divisors, whose sum is σ = 201333350400. Its totient is φ = 11199772800.

The previous prime is 51722968487. The next prime is 51722968511. The reversal of 51722968500 is 586922715.

51722968500 is a `hidden beast` number, since 51 + 7 + 2 + 2 + 96 + 8 + 500 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1781097 + ... + 1809903.

It is an arithmetic number, because the mean of its divisors is an integer number (524305600).

Almost surely, 2^51722968500 is an apocalyptic number.

51722968500 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 51722968500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100666675200).

51722968500 is an abundant number, since it is smaller than the sum of its proper divisors (149610381900).

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

51722968500 is a wasteful number, since it uses less digits than its factorization.

51722968500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28861 (or 28843 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The spelling of 51722968500 in words is "fifty-one billion, seven hundred twenty-two million, nine hundred sixty-eight thousand, five hundred".