51644946000 has 320 divisors, whose sum is σ = 181995780096. Its totient is φ = 12542976000.

The previous prime is 51644945993. The next prime is 51644946013. The reversal of 51644946000 is 64944615.

It is a self number, because there is not a number n which added to its sum of digits gives 51644946000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3153834 + ... + 3170166.

Almost surely, 2^51644946000 is an apocalyptic number.

51644946000 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 51644946000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90997890048).

51644946000 is an abundant number, since it is smaller than the sum of its proper divisors (130350834096).

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

51644946000 is a wasteful number, since it uses less digits than its factorization.

51644946000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16407 (or 16391 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 51644946000 in words is "fifty-one billion, six hundred forty-four million, nine hundred forty-six thousand".