51534642720 has 384 divisors, whose sum is σ = 188744048640. Its totient is φ = 11694510080.

The previous prime is 51534642701. The next prime is 51534642727. The reversal of 51534642720 is 2724643515.

It is not an unprimeable number, because it can be changed into a prime (51534642727) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5703166 + ... + 5712194.

It is an arithmetic number, because the mean of its divisors is an integer number (491520960).

Almost surely, 2^51534642720 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 51534642720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94372024320).

51534642720 is an abundant number, since it is smaller than the sum of its proper divisors (137209405920).

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

51534642720 is a wasteful number, since it uses less digits than its factorization.

51534642720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9128 (or 9120 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 39.

The spelling of 51534642720 in words is "fifty-one billion, five hundred thirty-four million, six hundred forty-two thousand, seven hundred twenty".