51220547568 has 120 divisors (see below), whose sum is σ = 151580048256. Its totient is φ = 16119705600.

The previous prime is 51220547531. The next prime is 51220547593. The reversal of 51220547568 is 86574502215.

51220547568 is a `hidden beast` number, since 5 + 12 + 20 + 54 + 7 + 568 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43096 + ... + 322952.

Almost surely, 2^51220547568 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 51220547568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75790024128).

51220547568 is an abundant number, since it is smaller than the sum of its proper divisors (100359500688).

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

51220547568 is a wasteful number, since it uses less digits than its factorization.

51220547568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279943 (or 279934 counting only the distinct ones).

The product of its (nonzero) digits is 672000, while the sum is 45.

The spelling of 51220547568 in words is "fifty-one billion, two hundred twenty million, five hundred forty-seven thousand, five hundred sixty-eight".