51994320336 has 240 divisors, whose sum is σ = 173870677120. Its totient is φ = 14572846080.

The previous prime is 51994320331. The next prime is 51994320373. The reversal of 51994320336 is 63302349915.

It is a junction number, because it is equal to n+sod(n) for n = 51994320291 and 51994320300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51994320331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8491356 + ... + 8497476.

Almost surely, 2^51994320336 is an apocalyptic number.

51994320336 is a gapful number since it is divisible by the number (56) 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 51994320336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86935338560).

51994320336 is an abundant number, since it is smaller than the sum of its proper divisors (121876356784).

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

51994320336 is a wasteful number, since it uses less digits than its factorization.

51994320336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6251 (or 6186 counting only the distinct ones).

The product of its (nonzero) digits is 524880, while the sum is 45.

The spelling of 51994320336 in words is "fifty-one billion, nine hundred ninety-four million, three hundred twenty thousand, three hundred thirty-six".