51618273280 has 192 divisors, whose sum is σ = 144847422720. Its totient is φ = 17285087232.

The previous prime is 51618273277. The next prime is 51618273293. The reversal of 51618273280 is 8237281615.

It is a super-2 number, since 2×51618273280² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3073867 + ... + 3090613.

It is an arithmetic number, because the mean of its divisors is an integer number (754413660).

Almost surely, 2^51618273280 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 51618273280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72423711360).

51618273280 is an abundant number, since it is smaller than the sum of its proper divisors (93229149440).

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

51618273280 is a wasteful number, since it uses less digits than its factorization.

51618273280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16824 (or 16804 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 43.

The spelling of 51618273280 in words is "fifty-one billion, six hundred eighteen million, two hundred seventy-three thousand, two hundred eighty".