51840917856 has 576 divisors, whose sum is σ = 187988830848. Its totient is φ = 13186105344.

The previous prime is 51840917833. The next prime is 51840917861. The reversal of 51840917856 is 65871904815.

It is a happy number.

51840917856 is a `hidden beast` number, since 5 + 18 + 409 + 178 + 56 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 187151190 + ... + 187151466.

It is an arithmetic number, because the mean of its divisors is an integer number (326369498).

Almost surely, 2^51840917856 is an apocalyptic number.

51840917856 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 51840917856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93994415424).

51840917856 is an abundant number, since it is smaller than the sum of its proper divisors (136147912992).

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

51840917856 is a wasteful number, since it uses less digits than its factorization.

51840917856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543 (or 532 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 54.

The spelling of 51840917856 in words is "fifty-one billion, eight hundred forty million, nine hundred seventeen thousand, eight hundred fifty-six".