521545841980 has 24 divisors (see below), whose sum is σ = 1096448552640. Its totient is φ = 208389330240.

The previous prime is 521545841897. The next prime is 521545841981. The reversal of 521545841980 is 89148545125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521545841981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14294235 + ... + 14330674.

It is an arithmetic number, because the mean of its divisors is an integer number (45685356360).

Almost surely, 2^521545841980 is an apocalyptic number.

It is an amenable number.

521545841980 is an abundant number, since it is smaller than the sum of its proper divisors (574902710660).

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

521545841980 is a wasteful number, since it uses less digits than its factorization.

521545841980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28625829 (or 28625827 counting only the distinct ones).

The product of its (nonzero) digits is 2304000, while the sum is 52.

The spelling of 521545841980 in words is "five hundred twenty-one billion, five hundred forty-five million, eight hundred forty-one thousand, nine hundred eighty".