53218566648 has 256 divisors, whose sum is σ = 168315840000. Its totient is φ = 15445002240.

The previous prime is 53218566613. The next prime is 53218566707. The reversal of 53218566648 is 84666581235.

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

It is a junction number, because it is equal to n+sod(n) for n = 53218566594 and 53218566603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12855763 + ... + 12859901.

It is an arithmetic number, because the mean of its divisors is an integer number (657483750).

Almost surely, 2^53218566648 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 53218566648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84157920000).

53218566648 is an abundant number, since it is smaller than the sum of its proper divisors (115097273352).

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

53218566648 is a wasteful number, since it uses less digits than its factorization.

53218566648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4427 (or 4417 counting only the distinct ones).

The product of its digits is 8294400, while the sum is 54.

The spelling of 53218566648 in words is "fifty-three billion, two hundred eighteen million, five hundred sixty-six thousand, six hundred forty-eight".