51646328360 has 96 divisors (see below), whose sum is σ = 129268530720. Its totient is φ = 18554067840.

The previous prime is 51646328339. The next prime is 51646328369. The reversal of 51646328360 is 6382364615.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (51646328369) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 337439 + ... + 466001.

It is an arithmetic number, because the mean of its divisors is an integer number (1346547195).

Almost surely, 2^51646328360 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 51646328360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64634265360).

51646328360 is an abundant number, since it is smaller than the sum of its proper divisors (77622202360).

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

51646328360 is a wasteful number, since it uses less digits than its factorization.

51646328360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128679 (or 128664 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 44.

The spelling of 51646328360 in words is "fifty-one billion, six hundred forty-six million, three hundred twenty-eight thousand, three hundred sixty".