521485732818 has 24 divisors (see below), whose sum is σ = 1134181908288. Its totient is φ = 173167630872.

The previous prime is 521485732769. The next prime is 521485732829. The reversal of 521485732818 is 818237584125.

It is a happy number.

521485732818 is a `hidden beast` number, since 5 + 2 + 1 + 48 + 573 + 28 + 1 + 8 = 666.

It is a super-2 number, since 2×521485732818² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55074030 + ... + 55083497.

It is an arithmetic number, because the mean of its divisors is an integer number (47257579512).

Almost surely, 2^521485732818 is an apocalyptic number.

521485732818 is an abundant number, since it is smaller than the sum of its proper divisors (612696175470).

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

521485732818 is a wasteful number, since it uses less digits than its factorization.

521485732818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110157798 (or 110157795 counting only the distinct ones).

The product of its digits is 4300800, while the sum is 54.

The spelling of 521485732818 in words is "five hundred twenty-one billion, four hundred eighty-five million, seven hundred thirty-two thousand, eight hundred eighteen".