521115650660 has 96 divisors (see below), whose sum is σ = 1223084016000. Its totient is φ = 184863651840.

The previous prime is 521115650641. The next prime is 521115650683. The reversal of 521115650660 is 66056511125.

It is a happy number.

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, 7809116 + ... + 7875564.

It is an arithmetic number, because the mean of its divisors is an integer number (12740458500).

Almost surely, 2^521115650660 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 521115650660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (611542008000).

521115650660 is an abundant number, since it is smaller than the sum of its proper divisors (701968365340).

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

521115650660 is a wasteful number, since it uses less digits than its factorization.

521115650660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67341 (or 67339 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 38.

The spelling of 521115650660 in words is "five hundred twenty-one billion, one hundred fifteen million, six hundred fifty thousand, six hundred sixty".