51749371872 has 144 divisors (see below), whose sum is σ = 161605342080. Its totient is φ = 15577632000.

The previous prime is 51749371829. The next prime is 51749371897. The reversal of 51749371872 is 27817394715.

51749371872 is a `hidden beast` number, since 5 + 1 + 7 + 493 + 71 + 87 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 424279 + ... + 532457.

It is an arithmetic number, because the mean of its divisors is an integer number (1122259320).

Almost surely, 2^51749371872 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 51749371872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80802671040).

51749371872 is an abundant number, since it is smaller than the sum of its proper divisors (109855970208).

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

51749371872 is a wasteful number, since it uses less digits than its factorization.

51749371872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108357 (or 108346 counting only the distinct ones).

The product of its digits is 2963520, while the sum is 54.

The spelling of 51749371872 in words is "fifty-one billion, seven hundred forty-nine million, three hundred seventy-one thousand, eight hundred seventy-two".