51934659840 has 504 divisors, whose sum is σ = 213185995008. Its totient is φ = 11869286400.

The previous prime is 51934659839. The next prime is 51934659863. The reversal of 51934659840 is 4895643915.

51934659840 is a `hidden beast` number, since 5 + 1 + 9 + 3 + 4 + 6 + 598 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (504).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 6527865 + ... + 6535815.

Almost surely, 2^51934659840 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 51934659840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106592997504).

51934659840 is an abundant number, since it is smaller than the sum of its proper divisors (161251335168).

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

51934659840 is an frugal number, since it uses more digits than its factorization.

51934659840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7997 (or 7968 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 54.

The spelling of 51934659840 in words is "fifty-one billion, nine hundred thirty-four million, six hundred fifty-nine thousand, eight hundred forty".