53685555840 has 640 divisors, whose sum is σ = 220260268800. Its totient is φ = 12206702592.

The previous prime is 53685555821. The next prime is 53685555947. The reversal of 53685555840 is 4855558635.

53685555840 is a `hidden beast` number, since 5 + 3 + 6 + 8 + 5 + 55 + 584 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (640).

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

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 79 ways as a sum of consecutive naturals, for example, 122290341 + ... + 122290779.

It is an arithmetic number, because the mean of its divisors is an integer number (344156670).

Almost surely, 2^53685555840 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 53685555840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110130134400).

53685555840 is an abundant number, since it is smaller than the sum of its proper divisors (166574712960).

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

53685555840 is a wasteful number, since it uses less digits than its factorization.

53685555840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814 (or 793 counting only the distinct ones).

The product of its (nonzero) digits is 14400000, while the sum is 54.

The spelling of 53685555840 in words is "fifty-three billion, six hundred eighty-five million, five hundred fifty-five thousand, eight hundred forty".