51688642368 has 224 divisors, whose sum is σ = 151856529408. Its totient is φ = 15386112000.

The previous prime is 51688642361. The next prime is 51688642381. The reversal of 51688642368 is 86324688615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51688642361) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28699068 + ... + 28700868.

Almost surely, 2^51688642368 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 51688642368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75928264704).

51688642368 is an abundant number, since it is smaller than the sum of its proper divisors (100167887040).

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

51688642368 is a wasteful number, since it uses less digits than its factorization.

51688642368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2061 (or 2051 counting only the distinct ones).

The product of its digits is 13271040, while the sum is 57.

The spelling of 51688642368 in words is "fifty-one billion, six hundred eighty-eight million, six hundred forty-two thousand, three hundred sixty-eight".