557821807660 has 192 divisors, whose sum is σ = 1325706117120. Its totient is φ = 195754890240.

The previous prime is 557821807657. The next prime is 557821807661. The reversal of 557821807660 is 66708128755.

It is a super-2 number, since 2×557821807660² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (557821807661) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 125435557 + ... + 125440003.

It is an arithmetic number, because the mean of its divisors is an integer number (6904719360).

Almost surely, 2^557821807660 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 557821807660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (662853058560).

557821807660 is an abundant number, since it is smaller than the sum of its proper divisors (767884309460).

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

557821807660 is a wasteful number, since it uses less digits than its factorization.

557821807660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4776 (or 4774 counting only the distinct ones).

The product of its (nonzero) digits is 5644800, while the sum is 55.

The spelling of 557821807660 in words is "five hundred fifty-seven billion, eight hundred twenty-one million, eight hundred seven thousand, six hundred sixty".