51636718000 has 480 divisors, whose sum is σ = 159724027008. Its totient is φ = 15759360000.

The previous prime is 51636717989. The next prime is 51636718009. The reversal of 51636718000 is 81763615.

It is not an unprimeable number, because it can be changed into a prime (51636718009) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 85917700 + ... + 85918300.

Almost surely, 2^51636718000 is an apocalyptic number.

51636718000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51636718000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79862013504).

51636718000 is an abundant number, since it is smaller than the sum of its proper divisors (108087309008).

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

51636718000 is a wasteful number, since it uses less digits than its factorization.

51636718000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686 (or 651 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 51636718000 in words is "fifty-one billion, six hundred thirty-six million, seven hundred eighteen thousand".