51897523860 has 648 divisors, whose sum is σ = 203869889496. Its totient is φ = 10642544640.

The previous prime is 51897523813. The next prime is 51897523877. The reversal of 51897523860 is 6832579815.

51897523860 is a `hidden beast` number, since 51 + 8 + 9 + 7 + 523 + 8 + 60 = 666.

It can be written as a sum of positive squares in 12 ways, for example, as 14927463684 + 36970060176 = 122178^2 + 192276^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51897523797 and 51897523806.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 55150990 + ... + 55151930.

It is an arithmetic number, because the mean of its divisors is an integer number (314614027).

Almost surely, 2^51897523860 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 51897523860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101934944748).

51897523860 is an abundant number, since it is smaller than the sum of its proper divisors (151972365636).

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

51897523860 is a wasteful number, since it uses less digits than its factorization.

51897523860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1033 (or 1008 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 54.

The spelling of 51897523860 in words is "fifty-one billion, eight hundred ninety-seven million, five hundred twenty-three thousand, eight hundred sixty".