51751835520 has 640 divisors, whose sum is σ = 208164211200. Its totient is φ = 10712739840.

The previous prime is 51751835477. The next prime is 51751835521. The reversal of 51751835520 is 2553815715.

It is a tau number, because it is divible by the number of its divisors (640).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51751835521) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 196774909 + ... + 196775171.

It is an arithmetic number, because the mean of its divisors is an integer number (325256580).

Almost surely, 2^51751835520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51751835520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104082105600).

51751835520 is an abundant number, since it is smaller than the sum of its proper divisors (156412375680).

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

51751835520 is an equidigital number, since it uses as much as digits as its factorization.

51751835520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336 (or 291 counting only the distinct ones).

The product of its (nonzero) digits is 210000, while the sum is 42.

The spelling of 51751835520 in words is "fifty-one billion, seven hundred fifty-one million, eight hundred thirty-five thousand, five hundred twenty".