57821666638260 has 768 divisors, whose sum is σ = 205916812738560. Its totient is φ = 11827385579520.

The previous prime is 57821666638163. The next prime is 57821666638271. The reversal of 57821666638260 is 6283666612875.

It is a junction number, because it is equal to n+sod(n) for n = 57821666638191 and 57821666638200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 2120248425 + ... + 2120275695.

It is an arithmetic number, because the mean of its divisors is an integer number (268120849920).

Almost surely, 2^{57821666638260} 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 57821666638260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102958406369280).

57821666638260 is an abundant number, since it is smaller than the sum of its proper divisors (148095146100300).

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

57821666638260 is a wasteful number, since it uses less digits than its factorization.

57821666638260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27556 (or 27554 counting only the distinct ones).

The product of its (nonzero) digits is 209018880, while the sum is 66.

The spelling of 57821666638260 in words is "fifty-seven trillion, eight hundred twenty-one billion, six hundred sixty-six million, six hundred thirty-eight thousand, two hundred sixty".