51668318016 has 224 divisors, whose sum is σ = 179195740160. Its totient is φ = 14286067200.

The previous prime is 51668318003. The next prime is 51668318063. The reversal of 51668318016 is 61081386615.

51668318016 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (224).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 306081 + ... + 443871.

Almost surely, 2^51668318016 is an apocalyptic number.

51668318016 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 51668318016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89597870080).

51668318016 is an abundant number, since it is smaller than the sum of its proper divisors (127527422144).

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

51668318016 is a wasteful number, since it uses less digits than its factorization.

51668318016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137850 (or 137834 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The spelling of 51668318016 in words is "fifty-one billion, six hundred sixty-eight million, three hundred eighteen thousand, sixteen".