51651256230 has 864 divisors, whose sum is σ = 183445516800. Its totient is φ = 10393463808.

The previous prime is 51651256199. The next prime is 51651256271. The reversal of 51651256230 is 3265215615.

51651256230 is a `hidden beast` number, since 5 + 1 + 6 + 5 + 1 + 25 + 623 + 0 = 666.

It is a super-2 number, since 2×51651256230² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 431 ways as a sum of consecutive naturals, for example, 653813331 + ... + 653813409.

It is an arithmetic number, because the mean of its divisors is an integer number (212321200).

Almost surely, 2^51651256230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51651256230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91722758400).

51651256230 is an abundant number, since it is smaller than the sum of its proper divisors (131794260570).

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

51651256230 is a wasteful number, since it uses less digits than its factorization.

51651256230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The spelling of 51651256230 in words is "fifty-one billion, six hundred fifty-one million, two hundred fifty-six thousand, two hundred thirty".