57721818418660 has 96 divisors (see below), whose sum is σ = 133564362704640. Its totient is φ = 20778873024000.

The previous prime is 57721818418637. The next prime is 57721818418673. The reversal of 57721818418660 is 6681481812775.

It is a junction number, because it is equal to n+sod(n) for n = 57721818418592 and 57721818418601.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 153507961 + ... + 153883519.

It is an arithmetic number, because the mean of its divisors is an integer number (1391295444840).

Almost surely, 2^{57721818418660} 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 57721818418660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66782181352320).

57721818418660 is an abundant number, since it is smaller than the sum of its proper divisors (75842544285980).

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

57721818418660 is a wasteful number, since it uses less digits than its factorization.

57721818418660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382597 (or 382595 counting only the distinct ones).

The product of its (nonzero) digits is 36126720, while the sum is 64.

The spelling of 57721818418660 in words is "fifty-seven trillion, seven hundred twenty-one billion, eight hundred eighteen million, four hundred eighteen thousand, six hundred sixty".