51866225280 has 192 divisors, whose sum is σ = 179220038400. Its totient is φ = 13821769728.

The previous prime is 51866225237. The next prime is 51866225291. The reversal of 51866225280 is 8252266815.

It is a happy number.

51866225280 is a `hidden beast` number, since 5 + 18 + 6 + 622 + 5 + 2 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a super-2 number, since 2×51866225280² (a number of 22 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16627561 + ... + 16630679.

It is an arithmetic number, because the mean of its divisors is an integer number (933437700).

Almost surely, 2^51866225280 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 51866225280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89610019200).

51866225280 is an abundant number, since it is smaller than the sum of its proper divisors (127353813120).

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

51866225280 is a wasteful number, since it uses less digits than its factorization.

51866225280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6031 (or 6016 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 45.

The spelling of 51866225280 in words is "fifty-one billion, eight hundred sixty-six million, two hundred twenty-five thousand, two hundred eighty".