51823819872 has 144 divisors (see below), whose sum is σ = 166143504240. Its totient is φ = 15704156160.

The previous prime is 51823819867. The next prime is 51823819891. The reversal of 51823819872 is 27891832815.

51823819872 is a `hidden beast` number, since 5 + 182 + 381 + 9 + 87 + 2 = 666.

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

It is a super-2 number, since 2×51823819872² (a number of 22 digits) contains 22 as substring.

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 polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 143313 + ... + 352400.

It is an arithmetic number, because the mean of its divisors is an integer number (1153774335).

Almost surely, 2^51823819872 is an apocalyptic number.

It is an amenable number.

51823819872 is an abundant number, since it is smaller than the sum of its proper divisors (114319684368).

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

51823819872 is a wasteful number, since it uses less digits than its factorization.

51823819872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495754 (or 495729 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 54.

It can be divided in two parts, 5182381 and 9872, that added together give a triangular number (5192253 = T₃₂₂₂).

The spelling of 51823819872 in words is "fifty-one billion, eight hundred twenty-three million, eight hundred nineteen thousand, eight hundred seventy-two".