51594385920 has 640 divisors, whose sum is σ = 210526525440. Its totient is φ = 10466426880.

The previous prime is 51594385897. The next prime is 51594385951. The reversal of 51594385920 is 2958349515.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (640).

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, 25427466 + ... + 25429494.

It is an arithmetic number, because the mean of its divisors is an integer number (328947696).

Almost surely, 2^51594385920 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 51594385920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105263262720).

51594385920 is an abundant number, since it is smaller than the sum of its proper divisors (158932139520).

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

51594385920 is a wasteful number, since it uses less digits than its factorization.

51594385920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2116 (or 2100 counting only the distinct ones).

The product of its (nonzero) digits is 1944000, while the sum is 51.

The spelling of 51594385920 in words is "fifty-one billion, five hundred ninety-four million, three hundred eighty-five thousand, nine hundred twenty".